继续按 align-linuxcnc 约束：补表达式运算源码回归

docs/linuxcnc-porting.md

@@ -34,7 +34,7 @@ This parser only exists to test the ABI and UI before Emscripten and LinuxCNC ar
 - spindle modes `G96`, `G97`
 - IJK and R arcs
 - numbered and named parameter assignment/reference such as `#1 = ...`, `#<name> = ...`, `X#1`, and nested expressions like `X[[#<name> + 2] * 3]`
-- expression functions `ABS[]`, `SQRT[]`, `EXP[]`, `LN[]`, degree-based `SIN[]`/`COS[]`/`TAN[]`/`ASIN[]`/`ACOS[]`, LinuxCNC-style `ATAN[]/[]`, and `FIX[]`/`FUP[]`/`ROUND[]`
+- expression functions `ABS[]`, `SQRT[]`, `EXP[]`, `LN[]`, degree-based `SIN[]`/`COS[]`/`TAN[]`/`ASIN[]`/`ACOS[]`, LinuxCNC-style `ATAN[]/[]`, `FIX[]`/`FUP[]`/`ROUND[]`, and source-linked `mod`/`**`/logical/relational operator precedence
 - numeric and named O-word subprograms such as `O100 call` and `O<name> call`
 - canned cycles `G73`, `G74`, `G81`, `G82`, `G83`, `G84`, `G85`, `G86`, `G87`, `G88`, `G89` with `G80`, `G98`, `G99`, `L`
 - coordinate offset events for `G10 L2`, `G10 L20`, `G54`-`G59.3`, `G52`, `G92`, `G92.1`, `G92.2`, and `G92.3`
@@ -212,5 +212,6 @@ This matrix tracks LinuxCNC feature coverage for the web/WASM simulator. A featu
 | 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` |
 | O-word subroutines, calls, and control flow | covered for numeric and named `O... sub/call/return/endsub` plus `if`/`elseif`/`else`, `while`, `repeat`, `do`/`while`, `break`, and `continue` through LinuxCNC file mode; 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/linuxcnc_oword_control_flow.ngc` |
+| Parameter expressions and operators | covered for parameter references and source-linked `mod`, `**`, logical, and relational operator precedence from LinuxCNC `interp_read.cc`/`interp_execute.cc` | `tests/gcode/linuxcnc_parameter_expression_assignment.ngc`, `tests/gcode/linuxcnc_expression_operators.ngc` |
 | Broader canned cycles `G73`, `G74`, `G82`-`G89` | partially covered: `G73`, `G74`, `G82`, `G83`, `G84`, `G85`, `G86`, `G87`, `G88`, `G89`; smoke parser maps supported cycles across `G17/G18/G19`, including LinuxCNC's special non-XY `G74/G84` tapping argument order and `G87` plane-specific `I/J/K` mapping; native/source regressions now check non-XY `G74/G84/G86/G87/G88` sequences | `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` |