继续按 align-linuxcnc 约束：补固定循环 native 覆盖，测试通过

结论：补齐 LinuxCNC interp_cycles.cc 固定循环错误 fixture 的 native 校验，覆盖重复次数、平面轴/R、Q/P、主轴状态和 G87 必需字；./test-native.sh 与 ./test-linuxcnc-source-link.sh 均通过，未扩展 smoke。

docs/linuxcnc-porting.md

@@ -208,7 +208,7 @@ This matrix tracks LinuxCNC feature coverage for the web/WASM simulator. A featu
 | Modal state save/restore `M70`-`M73` | covered for main-program save/invalidate/restore plus O-word subroutine autorestore in smoke parser, with native/source regressions checking restored distance mode, units, and XY plane motion | `tests/gcode/linuxcnc_modal_state.ngc`, `tests/gcode/linuxcnc_modal_autorestore.ngc` |
 | LinuxCNC read-only named parameters | common modal/unit/feed/spindle reads are covered through LinuxCNC native/source backends, with additional ccomp/spindle-mode readonly reads source-linked | `tests/gcode/linuxcnc_readonly_named_parameters.ngc`, `tests/gcode/linuxcnc_readonly_named_parameters_extra.ngc`, `tests/gcode/linuxcnc_lathe_diameter_mode.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` |
-| Canned cycle `G81/G80` | covered for drilling expand-to-canon path, including `G18/G19` plane-specific depth-axis mapping for representative drilling/boring cycles | `tests/gcode/linuxcnc_canned_cycle.ngc`, `tests/gcode/linuxcnc_canned_cycle_planes.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, and native/source LinuxCNC `interp_cycles.cc` validation of repeat counts, required R/depth words, invalid rotary axes, 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_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_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` |
 | Cutter compensation | covered for tool-table `G41/G42 D...` and explicit-radius `G41.1/G42.1/G40` through LinuxCNC native/source backends | `tests/gcode/linuxcnc_cutter_comp.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` |

test-linuxcnc-rs274-native.sh

@@ -427,6 +427,53 @@ for case in "${tool_length_offset_error_cases[@]}"; do
     grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_$fixture.err"
 done
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_canned_cycle.ngc >"$output_dir/cnc_sim_linuxcnc_canned_cycle.json"
+# Source basis: LinuxCNC src/emc/rs274ngc/interp_cycles.cc
+# convert_cycle() and the G73/G74/G82-G89 helpers validate canned-cycle
+# repeat counts, plane-specific axis/R words, Q/P requirements, and spindle
+# state before expanding cycles to Canon motion.
+canned_cycle_error_cases=(
+    "linuxcnc_canned_cycle_l0_error|Cannot do zero repeats of cycle"
+    "linuxcnc_canned_cycle_missing_r_error|R clearance plane unspecified in cycle"
+    "linuxcnc_canned_cycle_missing_z_error|Z value unspecified in xy plane canned cycle"
+    "linuxcnc_canned_cycle_g18_missing_y_error|Y value unspecified in xz plane canned cycle"
+    "linuxcnc_canned_cycle_g19_missing_x_error|X value unspecified in yz plane canned cycle"
+    "linuxcnc_canned_cycle_r_less_z_error|R less than z in cycle in xy plane"
+    "linuxcnc_canned_cycle_g18_r_less_y_error|R less than y in cycle in xz plane"
+    "linuxcnc_canned_cycle_g19_r_less_x_error|R less than x in cycle in yz plane"
+    "linuxcnc_canned_cycle_u_in_xy_error|Cannot put a U in a canned cycle in the XY plane"
+    "linuxcnc_canned_cycle_a_error|Cannot put an a in canned cycle"
+    "linuxcnc_canned_cycle_b_error|Cannot put a b in canned cycle"
+    "linuxcnc_canned_cycle_c_error|Cannot put a c in canned cycle"
+    "linuxcnc_canned_cycle_g73_missing_q_error|Q word missing with g73"
+    "linuxcnc_canned_cycle_g83_missing_q_error|Q word missing with g83"
+    "linuxcnc_canned_cycle_g73_q0_error|Negative or zero q value used"
+    "linuxcnc_canned_cycle_g83_q0_error|Negative or zero q value used"
+    "linuxcnc_canned_cycle_g82_missing_p_error|Dwell time p word missing with g82"
+    "linuxcnc_canned_cycle_g86_missing_p_error|Dwell time p word missing with g86"
+    "linuxcnc_canned_cycle_g88_missing_p_error|Dwell time p word missing with g88"
+    "linuxcnc_canned_cycle_g89_missing_p_error|Dwell time p word missing with g89"
+    "linuxcnc_canned_cycle_g74_clockwise_error|Spindle turning clockwise in G74"
+    "linuxcnc_canned_cycle_g84_counterclockwise_error|Spindle turning counterclockwise in G84"
+    "linuxcnc_canned_cycle_g74_stopped_spindle_error|Spindle not turning in G74"
+    "linuxcnc_canned_cycle_g84_stopped_spindle_error|Spindle not turning in G84"
+    "linuxcnc_canned_cycle_g86_stopped_spindle_error|Spindle not turning in g86"
+    "linuxcnc_canned_cycle_g88_stopped_spindle_error|Spindle not turning in g88"
+    "linuxcnc_canned_cycle_g87_stopped_spindle_error|Spindle not turning in g87"
+    "linuxcnc_canned_cycle_g87_missing_k_error|K word missing with g87"
+    "linuxcnc_canned_cycle_g87_missing_i_error|I word missing with g87"
+    "linuxcnc_canned_cycle_g87_missing_j_error|J word missing with g87"
+)
+for case in "${canned_cycle_error_cases[@]}"; do
+    fixture=${case%%|*}
+    expected=${case#*|}
+    if CNC_SIM_RS274_VAR="$var_file" \
+        "$build_dir/linuxcnc_rs274_dump" "tests/gcode/$fixture.ngc" \
+        >"$output_dir/cnc_sim_linuxcnc_$fixture.json" 2>"$output_dir/cnc_sim_linuxcnc_$fixture.err"; then
+        echo "expected $fixture.ngc to fail" >&2
+        exit 1
+    fi
+    grep -Fq "$expected" "$output_dir/cnc_sim_linuxcnc_$fixture.err"
+done
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_canned_cycles_extended.ngc >"$output_dir/cnc_sim_linuxcnc_canned_cycles_extended.json"
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_canned_cycle_planes.ngc >"$output_dir/cnc_sim_linuxcnc_canned_cycle_planes.json"
 CNC_SIM_RS274_VAR="$var_file" "$build_dir/linuxcnc_rs274_dump" tests/gcode/linuxcnc_arc_planes.ngc >"$output_dir/cnc_sim_linuxcnc_arc_planes.json"