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docs/linuxcnc-porting.md

@@ -199,7 +199,7 @@ This matrix tracks LinuxCNC feature coverage for the web/WASM simulator. A featu
 | Tool length offset `G43/G43.1/G43.2/G49` | covered with nonzero tool-table offset, dynamic replacement, additive axis offsets, `G43.2 H...`, clear, native/source missing-tool rejection, and native/source `G43.2` H/axis validation | `tests/gcode/linuxcnc_tool_length.ngc`, `tests/gcode/linuxcnc_dynamic_tool_length.ngc`, `tests/gcode/linuxcnc_g43_missing_tool_error.ngc`, `tests/gcode/linuxcnc_g43_2_missing_tool_error.ngc`, `tests/gcode/linuxcnc_g43_2_h_axis_error.ngc`, `tests/gcode/linuxcnc_g43_2_missing_h_axis_error.ngc` |
 | RTCP controls `G43.4/G43.5/G49` | covered as simulator-owned control lines | `tests/gcode/linuxcnc_rtcp_controls.ngc` |
 | Kinematics switch `M428/M429/M430` | covered as simulator-owned control lines | `tests/gcode/linuxcnc_rtcp_controls.ngc` |
-| Spindle, coolant, program stops, and current tool number `M3/M4/M5`, `M7/M8/M9`, `M0/M1/M60/M30`, `M61 Q...` | covered through LinuxCNC native/source backends, including native/source `convert_m()` rejection of out-of-range `M3/M4/M5 $` spindle selectors and negative `M61 Q` | `tests/gcode/linuxcnc_spindle_direction.ngc`, `tests/gcode/linuxcnc_coolant.ngc`, `tests/gcode/linuxcnc_program_stops.ngc`, `tests/gcode/linuxcnc_tool_number.ngc`, `tests/gcode/linuxcnc_m3_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m4_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m5_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m61_negative_q_error.ngc` |
+| Spindle, coolant, program stops, and current tool number `M3/M4/M5`, `M7/M8/M9`, `M0/M1/M2/M60/M30/M99`, `M61 Q...` | covered through LinuxCNC native/source backends, including native/source `convert_m()` rejection of out-of-range `M3/M4/M5 $` spindle selectors and negative `M61 Q`, plus `convert_stop()` coverage for M2 reset/program-end and default main-program M99 program-end without M30-only pallet shuttle | `tests/gcode/linuxcnc_spindle_direction.ngc`, `tests/gcode/linuxcnc_coolant.ngc`, `tests/gcode/linuxcnc_program_stops.ngc`, `tests/gcode/linuxcnc_program_end_m2.ngc`, `tests/gcode/linuxcnc_program_end_m99.ngc`, `tests/gcode/linuxcnc_tool_number.ngc`, `tests/gcode/linuxcnc_m3_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m4_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m5_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m61_negative_q_error.ngc` |
 | Spindle speed mode `G96/G97` | covered with Canon `SET_SPINDLE_MODE` preserved as mode state events, including `G96 D...` max-RPM value and native/source `check_other_codes()` rejection of missing `S` with `G96` | `tests/gcode/linuxcnc_spindle_modes.ngc`, `tests/gcode/linuxcnc_g96_missing_s_word_error.ngc` |
 | Spindle orientation `M19 R... P... Q...` | covered with Canon `ORIENT_SPINDLE` and `WAIT_SPINDLE_ORIENT_COMPLETE` preserved as temporary mode state events, including native/source `check_other_codes()` validation for `P/R` words and `convert_m()` rejection of out-of-range `$` selectors and nonpositive `Q` waits | `tests/gcode/linuxcnc_spindle_orient.ngc`, `tests/gcode/linuxcnc_m19_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m19_p_not_integer_error.ngc`, `tests/gcode/linuxcnc_m19_p_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m19_r_out_of_range_error.ngc`, `tests/gcode/linuxcnc_m19_zero_q_error.ngc` |
 | Spindle-synchronized feed and threading `G33/G33.1/G76` | covered through smoke, LinuxCNC native, and source-linked paths with Canon `START_SPEED_FEED_SYNCH`/`STOP_SPEED_FEED_SYNCH` preserved, rigid-tap line numbers normalized, G76 multi-pass threading smoke-covered, native/source `check_other_codes()` validation for required/disallowed `K/F/P/I/J` words, and native/source `convert_straight()`/`convert_threading_cycle()` coverage for standalone G76 and rejection of invalid spindle state, spindle selector, rotary-axis motion, and G76 `I/J/K` geometry | `tests/gcode/linuxcnc_threading_sync.ngc`, `tests/gcode/linuxcnc_threading_cycle.ngc`, `tests/gcode/linuxcnc_g76only.ngc`, `tests/gcode/linuxcnc_g33_missing_k_word_error.ngc`, `tests/gcode/linuxcnc_g33_f_word_error.ngc`, `tests/gcode/linuxcnc_g33_1_missing_k_word_error.ngc`, `tests/gcode/linuxcnc_g33_1_f_word_error.ngc`, `tests/gcode/linuxcnc_g76_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_g76_missing_i_word_error.ngc`, `tests/gcode/linuxcnc_g76_missing_j_word_error.ngc`, `tests/gcode/linuxcnc_g76_missing_k_word_error.ngc`, `tests/gcode/linuxcnc_g33_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_g33_1_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_g33_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_g33_1_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_g76_spindle_dollar_out_of_range_error.ngc`, `tests/gcode/linuxcnc_g76_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_g76_rotary_axis_error.ngc`, `tests/gcode/linuxcnc_g76_i_zero_error.ngc`, `tests/gcode/linuxcnc_g76_j_zero_error.ngc`, `tests/gcode/linuxcnc_g76_k_less_equal_j_error.ngc`, smoke API regression |
@@ -210,15 +210,16 @@ This matrix tracks LinuxCNC feature coverage for the web/WASM simulator. A featu
 | LinuxCNC read-only named parameters | common modal/unit/feed/spindle reads and additional ccomp/spindle-mode readonly reads are covered through LinuxCNC native/source backends | `tests/gcode/linuxcnc_readonly_named_parameters.ngc`, `tests/gcode/linuxcnc_readonly_named_parameters_extra.ngc`, `tests/gcode/linuxcnc_lathe_diameter_mode.ngc` |
 | LinuxCNC numbered parameters | native/source coverage checks readonly numbered-parameter rejection plus probe, tool, G28/G30, G52/G92, G5X/G59.3, debug/M66 result, tool-offset, current-position, `restore_parameters()`/`save_parameters()` persistence, and volatile global numbered parameters from LinuxCNC source state | `tests/gcode/linuxcnc_numbered_parameters.ngc`, `tests/gcode/linuxcnc_rotary_probe_numbered_parameters.ngc`, `tests/gcode/linuxcnc_multi_rotary_probe_numbered_parameters.ngc`, `tests/gcode/linuxcnc_tool_info_zero_parameter.ngc`, `tests/gcode/linuxcnc_spindle_tool_info_parameter.ngc`, `tests/gcode/linuxcnc_readonly_numbered_parameter_assign_error.ngc`, `tests/gcode/linuxcnc_g28_g30_numbered_parameters.ngc`, `tests/gcode/linuxcnc_rotary_g28_g30_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g92_numbered_parameters.ngc`, `tests/gcode/linuxcnc_rotary_g92_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g52_g92_numbered_interaction.ngc`, `tests/gcode/linuxcnc_g5x_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g59_3_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g59_3_rotary_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g5x_rotary_numbered_parameters.ngc`, `tests/gcode/linuxcnc_g54_rotary_numbered_parameters.ngc`, `tests/gcode/linuxcnc_debug_level_parameter.ngc`, `tests/gcode/linuxcnc_m66_result_parameter.ngc`, `tests/gcode/linuxcnc_tool_offset_numbered_parameters.ngc`, `tests/gcode/linuxcnc_rotary_tool_offset_numbered_parameters.ngc`, `tests/gcode/linuxcnc_current_position_numbered_parameters.ngc`, `tests/gcode/linuxcnc_persistent_parameters_set.ngc`, `tests/gcode/linuxcnc_persistent_parameters_check.ngc`, `tests/gcode/linuxcnc_rotary_persistent_parameters_set.ngc`, `tests/gcode/linuxcnc_rotary_persistent_parameters_check.ngc`, `tests/gcode/linuxcnc_g54_persistent_parameters_set.ngc`, `tests/gcode/linuxcnc_g54_persistent_parameters_check.ngc`, `tests/gcode/linuxcnc_user_persistent_parameter_set.ngc`, `tests/gcode/linuxcnc_user_persistent_parameter_check.ngc`, `tests/gcode/linuxcnc_user_persistent_parameter_existing_check.ngc`, `tests/gcode/linuxcnc_user_persistent_parameter_boundary_set.ngc`, `tests/gcode/linuxcnc_user_persistent_parameter_boundary_check.ngc`, `tests/gcode/linuxcnc_volatile_global_parameter_set.ngc`, `tests/gcode/linuxcnc_volatile_global_parameter_check.ngc` |
 | Feed and motion control modes `G93/G94/G95`, `G61/G61.1/G64` | covered through LinuxCNC native/source backends | `tests/gcode/linuxcnc_feed_modes.ngc`, `tests/gcode/linuxcnc_motion_modes.ngc` |
+| Dwell `G4 P...` | covered through LinuxCNC native/source backends for missing-P rejection and boundary values around LinuxCNC's exact `P-1.0` missing-value sentinel; neighboring negative P values are passed through to `DWELL` by `convert_dwell()` | `tests/gcode/linuxcnc_g4_missing_p_error.ngc`, `tests/gcode/linuxcnc_g4_negative_p_error.ngc`, `tests/gcode/linuxcnc_g4_dwell_boundaries.ngc` |
 | Canned cycle `G73`-`G89`/`G80` | covered for drilling expand-to-canon path, `G18/G19` plane-specific depth-axis mapping for representative drilling/boring cycles, `G17.1` extended-plane depth/retract mapping, and native/source LinuxCNC `interp_cycles.cc` validation of repeat counts, required R/depth words, invalid rotary axes including follow-up modal-cycle blocks, Q/P words, and spindle state | `tests/gcode/linuxcnc_canned_cycle.ngc`, `tests/gcode/linuxcnc_canned_cycles_extended.ngc`, `tests/gcode/linuxcnc_canned_cycle_planes.ngc`, `tests/gcode/linuxcnc_extended_plane_cycle.ngc`, `tests/gcode/linuxcnc_canned_cycle_l0_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_missing_r_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_missing_z_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g18_missing_y_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g19_missing_x_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_r_less_z_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g18_r_less_y_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g19_r_less_x_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_u_in_xy_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_a_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_b_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_c_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_reject_rotary_followup.ngc`, `tests/gcode/linuxcnc_canned_cycle_g73_missing_q_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g83_missing_q_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g73_q0_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g83_q0_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g82_missing_p_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g86_missing_p_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g88_missing_p_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g89_missing_p_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g74_clockwise_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g84_counterclockwise_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g74_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g84_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g86_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g88_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g87_stopped_spindle_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g87_missing_k_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g87_missing_i_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g87_missing_j_error.ngc` |
 | Coordinate offset Canon events `G10 L2`, `G10 L20`, `G10 P0 active-system targeting`, `G54`-`G59.3` selection, `G52`, `G92/G92.1/G92.2/G92.3` | covered through LinuxCNC native/source backends, including all nine G5X indices | `tests/gcode/linuxcnc_coordinate_offsets.ngc`, `tests/gcode/linuxcnc_coordinate_l20.ngc`, `tests/gcode/linuxcnc_coordinate_p0.ngc`, `tests/gcode/linuxcnc_coordinate_select_all.ngc`, `tests/gcode/linuxcnc_g92_restore.ngc`, `tests/gcode/linuxcnc_g52_offset.ngc` |
 | NURBS `G5.2/G5.3/G6.2` | covered through LinuxCNC native/source backends for `G18` XZ-plane endpoint mapping from `convert_nurbs()` | `tests/gcode/linuxcnc_g52_xz_nurbs.ngc`, `tests/gcode/linuxcnc_g62_xz_nurbs.ngc` |
 | Cutter compensation | covered for tool-table `G41/G42 D...` and explicit-radius `G41.1/G42.1/G40` through LinuxCNC native/source backends, plus native/source LinuxCNC rejection of tool changes, M66 waits, G71.0, retract-mode changes, arc exits, and gouging while compensation is active | `tests/gcode/linuxcnc_cutter_comp.ngc`, `tests/gcode/linuxcnc_cutter_comp_tool_change_error.ngc`, `tests/gcode/linuxcnc_cutter_comp_wait_input_error.ngc`, `tests/gcode/linuxcnc_cutter_comp_g71_error.ngc`, `tests/gcode/linuxcnc_canned_cycle_g98_retract_error.ngc`, `tests/gcode/linuxcnc_ccomp_arcexit_error.ngc`, `tests/gcode/linuxcnc_ccomp_gouging_error.ngc` |
 | Probe moves `G38.2/G38.3/G38.4/G38.5` | covered as distinct probe events with LinuxCNC `probe_type` preserved through smoke, native, and source-linked paths | `tests/gcode/linuxcnc_probe_no_error.ngc` |
-| O-word and Fanuc subroutines, calls, and control flow | covered for numeric and named `O... sub/call/return/endsub`, Fanuc-style `M98 P... L...`/`M99`, plus `if`/`elseif`/`else`, `while`, `repeat`, `do`/`while`, `break`, and `continue` through LinuxCNC file mode; native/source read errors cover malformed O-word commands, missing control-expression brackets, too many or empty call parameters, Fanuc-style `M98` missing `P`, and midline/comment-prefixed `M98` falling through to normal M-code handling; native/source execution errors cover duplicate/undefined/unmatched labels, out-of-context `return`/`endsub`, wrong subroutine close style, nested subroutine definitions, too many nested call levels, lowercase numeric labels, O-word state parameters, `EXISTS[]` word-value checks, and M98/O-word local-parameter style differences; smoke parser also covers named `O<name>` sub/call/return/endsub and loop-control forms | `tests/gcode/smoke_oword_subprogram.ngc`, `tests/gcode/linuxcnc_named_oword_subprogram.ngc`, `tests/gcode/smoke_subprogram_m98.ngc`, `tests/gcode/linuxcnc_oword_control_flow.ngc`, `tests/gcode/linuxcnc_value_returned.ngc`, `tests/gcode/linuxcnc_call_level.ngc`, `tests/gcode/linuxcnc_exists_word_value.ngc`, `tests/gcode/linuxcnc_lowercase_numeric_oword.ngc`, `tests/gcode/linuxcnc_m98_mixed_styles_variables.ngc`, `tests/gcode/linuxcnc_oword_unknown_command_error.ngc`, `tests/gcode/linuxcnc_oword_unexpected_trailing_item_error.ngc`, `tests/gcode/linuxcnc_oword_if_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_while_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_repeat_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_too_many_call_parameters_error.ngc`, `tests/gcode/linuxcnc_oword_empty_call_parameter_error.ngc`, `tests/gcode/linuxcnc_oword_too_many_call_levels_error.ngc`, `tests/gcode/linuxcnc_oword_endsub_without_sub_error.ngc`, `tests/gcode/linuxcnc_oword_return_without_sub_error.ngc`, `tests/gcode/linuxcnc_oword_duplicate_if_label_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_else_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_endif_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_break_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_continue_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_endwhile_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_no_matching_if_error.ngc`, `tests/gcode/linuxcnc_oword_break_no_matching_loop_error.ngc`, `tests/gcode/linuxcnc_oword_continue_no_matching_loop_error.ngc`, `tests/gcode/linuxcnc_oword_endrepeat_no_matching_repeat_error.ngc`, `tests/gcode/linuxcnc_oword_endif_no_matching_if_error.ngc`, `tests/gcode/linuxcnc_oword_endwhile_no_matching_while_error.ngc`, `tests/gcode/linuxcnc_oword_fanuc_requires_m99_error.ngc`, `tests/gcode/linuxcnc_oword_sub_requires_endsub_error.ngc`, `tests/gcode/linuxcnc_nested_subroutine_definition_error.ngc`, `tests/gcode/linuxcnc_m98_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_midline_m98_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_m98_error.ngc` |
+| O-word and Fanuc subroutines, calls, and control flow | covered for numeric and named `O... sub/call/return/endsub`, Fanuc-style `M98 P... L...`/`M99`, plus `if`/`elseif`/`else`, `while`, `repeat`, `do`/`while`, `break`, and `continue` through LinuxCNC file mode; native/source read errors cover malformed O-word commands, missing control-expression brackets, too many or empty call parameters, Fanuc-style `M98` missing `P`, and midline/comment-prefixed `M98` falling through to normal M-code handling; native/source execution errors cover duplicate/undefined/unmatched labels, out-of-context `return`/`endsub`, wrong subroutine close style, nested subroutine definitions, numbered subroutine illegal-location rejection, main-file EOF after numeric O-word return, too many nested call levels, lowercase numeric labels, O-word state parameters, `EXISTS[]` word-value checks, and M98/O-word local-parameter style differences; smoke parser also covers named `O<name>` sub/call/return/endsub and loop-control forms | `tests/gcode/smoke_oword_subprogram.ngc`, `tests/gcode/linuxcnc_named_oword_subprogram.ngc`, `tests/gcode/smoke_subprogram_m98.ngc`, `tests/gcode/linuxcnc_oword_control_flow.ngc`, `tests/gcode/linuxcnc_value_returned.ngc`, `tests/gcode/linuxcnc_call_level.ngc`, `tests/gcode/linuxcnc_exists_word_value.ngc`, `tests/gcode/linuxcnc_lowercase_numeric_oword.ngc`, `tests/gcode/linuxcnc_m98_mixed_styles_variables.ngc`, `tests/gcode/linuxcnc_numeric_oword_main_eof_error.ngc`, `tests/gcode/linuxcnc_numeric_oword_sub_illegal_location.ngc`, `tests/gcode/linuxcnc_oword_unknown_command_error.ngc`, `tests/gcode/linuxcnc_oword_unexpected_trailing_item_error.ngc`, `tests/gcode/linuxcnc_oword_if_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_while_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_repeat_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_oword_too_many_call_parameters_error.ngc`, `tests/gcode/linuxcnc_oword_empty_call_parameter_error.ngc`, `tests/gcode/linuxcnc_oword_too_many_call_levels_error.ngc`, `tests/gcode/linuxcnc_oword_endsub_without_sub_error.ngc`, `tests/gcode/linuxcnc_oword_return_without_sub_error.ngc`, `tests/gcode/linuxcnc_oword_duplicate_if_label_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_else_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_endif_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_break_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_continue_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_endwhile_undefined_label_error.ngc`, `tests/gcode/linuxcnc_oword_elseif_no_matching_if_error.ngc`, `tests/gcode/linuxcnc_oword_break_no_matching_loop_error.ngc`, `tests/gcode/linuxcnc_oword_continue_no_matching_loop_error.ngc`, `tests/gcode/linuxcnc_oword_endrepeat_no_matching_repeat_error.ngc`, `tests/gcode/linuxcnc_oword_endif_no_matching_if_error.ngc`, `tests/gcode/linuxcnc_oword_endwhile_no_matching_while_error.ngc`, `tests/gcode/linuxcnc_oword_fanuc_requires_m99_error.ngc`, `tests/gcode/linuxcnc_oword_sub_requires_endsub_error.ngc`, `tests/gcode/linuxcnc_nested_subroutine_definition_error.ngc`, `tests/gcode/linuxcnc_m98_missing_p_word_error.ngc`, `tests/gcode/linuxcnc_midline_m98_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_m98_error.ngc` |
 | Parameter expressions and operators | covered for parameter references, native/source bracketed word-value whitespace, `mod`, `**`, logical, and relational operator precedence, plus LinuxCNC parameter-setting syntax, parameter index validation, named-parameter termination, real-number parsing, divide-by-zero, negative sqrt/power, infinity rejection, malformed and bare `ATAN[]/[]`, unary operation syntax including bare unary items, `read_operation_unary()` unknown-word branches, `read_operation()` binary-operation prefix, unknown operation, and unclosed-expression error paths from `interp_read.cc`/`interp_execute.cc` | `tests/gcode/linuxcnc_parameter_expression_assignment.ngc`, `tests/gcode/linuxcnc_word_bracket_whitespace.ngc`, `tests/gcode/linuxcnc_parameter_missing_equal_error.ngc`, `tests/gcode/linuxcnc_midline_parameter_missing_equal_error.ngc`, `tests/gcode/linuxcnc_parameter_missing_value_error.ngc`, `tests/gcode/linuxcnc_parameter_number_out_of_range_error.ngc`, `tests/gcode/linuxcnc_parameter_reference_out_of_range_error.ngc`, `tests/gcode/linuxcnc_non_integer_parameter_index_error.ngc`, `tests/gcode/linuxcnc_named_parameter_not_terminated_error.ngc`, `tests/gcode/linuxcnc_no_real_value_error.ngc`, `tests/gcode/linuxcnc_bad_number_format_error.ngc`, `tests/gcode/linuxcnc_expression_operators.ngc`, `tests/gcode/linuxcnc_negative_sqrt_error.ngc`, `tests/gcode/linuxcnc_divide_by_zero_error.ngc`, `tests/gcode/linuxcnc_negative_power_error.ngc`, `tests/gcode/linuxcnc_infinite_expression_error.ngc`, `tests/gcode/linuxcnc_atan_missing_slash_error.ngc`, `tests/gcode/linuxcnc_atan_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_top_level_bare_atan_error.ngc`, `tests/gcode/linuxcnc_midline_bare_atan_error.ngc`, `tests/gcode/linuxcnc_unary_missing_bracket_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_c_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_e_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_f_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_l_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_r_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_s_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_t_word_error.ngc`, `tests/gcode/linuxcnc_unary_unknown_default_word_error.ngc`, `tests/gcode/linuxcnc_top_level_bare_unary_error.ngc`, `tests/gcode/linuxcnc_midline_bare_unary_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_a_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_e_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_g_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_l_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_m_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_n_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_o_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_x_operation_error.ngc`, `tests/gcode/linuxcnc_binary_unknown_operation_error.ngc`, `tests/gcode/linuxcnc_unclosed_expression_error.ngc` |
 | Word reader validation | LinuxCNC native/source reader errors covered for negative `F/G/H/L/M/S/T` values and repeated `A/B/C/D/E/F/H/I/J/K/L/P/Q/R/S/T/U/V/W/X/Y/Z` words from `interp_read.cc` | `tests/gcode/linuxcnc_negative_f_word_error.ngc`, `tests/gcode/linuxcnc_negative_g_code_error.ngc`, `tests/gcode/linuxcnc_negative_h_word_error.ngc`, `tests/gcode/linuxcnc_negative_l_word_error.ngc`, `tests/gcode/linuxcnc_negative_m_code_error.ngc`, `tests/gcode/linuxcnc_negative_s_word_error.ngc`, `tests/gcode/linuxcnc_negative_t_word_error.ngc`, `tests/gcode/linuxcnc_multiple_a_words_error.ngc`, `tests/gcode/linuxcnc_multiple_b_words_error.ngc`, `tests/gcode/linuxcnc_multiple_c_words_error.ngc`, `tests/gcode/linuxcnc_multiple_d_words_error.ngc`, `tests/gcode/linuxcnc_multiple_e_words_error.ngc`, `tests/gcode/linuxcnc_multiple_f_words_error.ngc`, `tests/gcode/linuxcnc_multiple_h_words_error.ngc`, `tests/gcode/linuxcnc_multiple_i_words_error.ngc`, `tests/gcode/linuxcnc_multiple_j_words_error.ngc`, `tests/gcode/linuxcnc_multiple_k_words_error.ngc`, `tests/gcode/linuxcnc_multiple_l_words_error.ngc`, `tests/gcode/linuxcnc_multiple_p_words_error.ngc`, `tests/gcode/linuxcnc_multiple_q_words_error.ngc`, `tests/gcode/linuxcnc_multiple_r_words_error.ngc`, `tests/gcode/linuxcnc_multiple_s_words_error.ngc`, `tests/gcode/linuxcnc_multiple_t_words_error.ngc`, `tests/gcode/linuxcnc_multiple_u_words_error.ngc`, `tests/gcode/linuxcnc_multiple_v_words_error.ngc`, `tests/gcode/linuxcnc_multiple_w_words_error.ngc`, `tests/gcode/linuxcnc_multiple_x_words_error.ngc`, `tests/gcode/linuxcnc_multiple_y_words_error.ngc`, `tests/gcode/linuxcnc_multiple_z_words_error.ngc` |
 | G/M reader validation | LinuxCNC native/source `read_g()`/`read_m()` errors covered for range checks, unknown code tables, and same-modal-group conflicts from `interp_read.cc` and `interp_array.cc` | `tests/gcode/linuxcnc_g_code_out_of_range_error.ngc`, `tests/gcode/linuxcnc_unknown_g_code_error.ngc`, `tests/gcode/linuxcnc_two_g_codes_same_modal_group_error.ngc`, `tests/gcode/linuxcnc_m_code_greater_199_error.ngc`, `tests/gcode/linuxcnc_unknown_m_code_error.ngc`, `tests/gcode/linuxcnc_two_m_codes_same_modal_group_error.ngc` |
-| Block/item reader validation | LinuxCNC native/source errors covered for repeated `$`, block-delete execution skipping, unused `D/$/E/H/I/J/K/L/P/Q/R` words, bad item-start characters, middle-of-line or comment-prefixed `N` words, comment-prefixed or midline `O` words, top-level or midline bracket items, naked top-level numbers, non-leading ATAN argument slashes, malformed leading `N` numbers, EOF/program-end file checks, overlong file lines, and too many M-codes from `interp_read.cc`, `interp_array.cc`, and `interp_check.cc` | `tests/gcode/linuxcnc_block_delete.ngc`, `tests/gcode/linuxcnc_multiple_spindle_choice_words_error.ngc`, `tests/gcode/linuxcnc_d_word_no_use_error.ngc`, `tests/gcode/linuxcnc_spindle_dollar_no_use_error.ngc`, `tests/gcode/linuxcnc_e_word_no_use_error.ngc`, `tests/gcode/linuxcnc_h_word_no_use_error.ngc`, `tests/gcode/linuxcnc_i_word_no_use_error.ngc`, `tests/gcode/linuxcnc_j_word_no_use_error.ngc`, `tests/gcode/linuxcnc_k_word_no_use_error.ngc`, `tests/gcode/linuxcnc_l_word_no_use_error.ngc`, `tests/gcode/linuxcnc_p_word_no_use_error.ngc`, `tests/gcode/linuxcnc_q_word_no_use_error.ngc`, `tests/gcode/linuxcnc_r_word_no_use_error.ngc`, `tests/gcode/linuxcnc_bad_character_bang_error.ngc`, `tests/gcode/linuxcnc_bad_character_middle_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_spaced_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_oword_error.ngc`, `tests/gcode/linuxcnc_midline_numeric_oword_error.ngc`, `tests/gcode/linuxcnc_midline_named_oword_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_left_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_right_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_midline_left_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_midline_right_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_number_error.ngc`, `tests/gcode/linuxcnc_top_level_bare_atan_error.ngc`, `tests/gcode/linuxcnc_midline_bare_atan_error.ngc`, `tests/gcode/linuxcnc_bad_n_number_format_error.ngc`, `tests/gcode/linuxcnc_file_ended_no_program_end_error.ngc`, `tests/gcode/linuxcnc_file_ended_no_percent_error.ngc`, generated `linuxcnc_command_too_long_error.ngc`, `tests/gcode/linuxcnc_too_many_m_codes_error.ngc` |
+| Block/item reader validation | LinuxCNC native/source errors covered for repeated `$`, block-delete execution skipping, unused `D/$/E/H/I/J/K/L/P/Q/R` words, bad item-start characters, middle-of-line or comment-prefixed `N` words, comment-prefixed or midline `O` words, top-level or midline bracket items, naked top-level numbers, non-leading ATAN argument slashes, malformed leading `N` numbers, EOF/program-end file checks, overlong file lines, too many M-codes, fractional/extended N-word sequence numbers, `close_and_downcase()` case/whitespace normalization, and percent-file termination from `interp_read.cc`, `interp_internal.cc`, `rs274ngc_pre.cc`, `interp_array.cc`, and `interp_check.cc` | `tests/gcode/linuxcnc_block_delete.ngc`, `tests/gcode/linuxcnc_multiple_spindle_choice_words_error.ngc`, `tests/gcode/linuxcnc_d_word_no_use_error.ngc`, `tests/gcode/linuxcnc_spindle_dollar_no_use_error.ngc`, `tests/gcode/linuxcnc_e_word_no_use_error.ngc`, `tests/gcode/linuxcnc_h_word_no_use_error.ngc`, `tests/gcode/linuxcnc_i_word_no_use_error.ngc`, `tests/gcode/linuxcnc_j_word_no_use_error.ngc`, `tests/gcode/linuxcnc_k_word_no_use_error.ngc`, `tests/gcode/linuxcnc_l_word_no_use_error.ngc`, `tests/gcode/linuxcnc_p_word_no_use_error.ngc`, `tests/gcode/linuxcnc_q_word_no_use_error.ngc`, `tests/gcode/linuxcnc_r_word_no_use_error.ngc`, `tests/gcode/linuxcnc_bad_character_bang_error.ngc`, `tests/gcode/linuxcnc_bad_character_middle_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_spaced_n_word_error.ngc`, `tests/gcode/linuxcnc_comment_prefixed_oword_error.ngc`, `tests/gcode/linuxcnc_midline_numeric_oword_error.ngc`, `tests/gcode/linuxcnc_midline_named_oword_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_left_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_right_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_midline_left_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_midline_right_bracket_error.ngc`, `tests/gcode/linuxcnc_bad_character_top_number_error.ngc`, `tests/gcode/linuxcnc_top_level_bare_atan_error.ngc`, `tests/gcode/linuxcnc_midline_bare_atan_error.ngc`, `tests/gcode/linuxcnc_bad_n_number_format_error.ngc`, `tests/gcode/linuxcnc_file_ended_no_program_end_error.ngc`, `tests/gcode/linuxcnc_file_ended_no_percent_error.ngc`, generated `linuxcnc_command_too_long_error.ngc`, `tests/gcode/linuxcnc_too_many_m_codes_error.ngc`, `tests/gcode/linuxcnc_fractional_linenumbers.ngc`, `tests/gcode/linuxcnc_extended_linenumbers.ngc`, `tests/gcode/linuxcnc_close_and_downcase_words.ngc`, `tests/gcode/linuxcnc_percent_file_ignores_trailing.ngc` |
 | Broader canned cycles `G73`, `G74`, `G82`-`G89` | covered for representative LinuxCNC native/source `G73`, `G74`, `G82`, `G83`, `G84`, `G85`, `G86`, `G87`, `G88`, and `G89` sequences from `interp_cycles.cc`, including peck drilling, feed-out boring, stop/restart boring, dwell/feed-out boring, special non-XY `G74/G84` tapping argument order, and `G87` plane-specific `I/J/K` mapping; smoke parser still maps supported cycles across `G17/G18/G19` | `tests/gcode/linuxcnc_canned_cycles_extended.ngc`, `tests/gcode/linuxcnc_canned_cycle_planes.ngc`, smoke API regression |
 | Full source-level wasm build | covered for the current wasm-safe RS274 source set, with remaining work focused on broadening browser-hostile dependency replacement and feature coverage | `./build-wasm.sh`, `test-linuxcnc-wasm-runtime-link.sh`, `test-web-wasm-node-smoke.sh`, `test-web-wasm-browser-smoke.sh` |