feat: complete LinuxCNC G-code and M-code coverage

[misiekhardcore]

Description

Brings the LinuxCNC dialect database to full parity with the official LinuxCNC command set. Previously only ~40 of the ~100 supported commands had hover documentation and completions. This adds the remaining 60 commands across G-codes and M-codes, and introduces 10 new CommandGroup categories to properly classify them.

Type of Change

• New feature (non-breaking change which adds functionality)

Related Issues

N/A

Changes Made

src/databases/types.ts

• Added 10 new CommandGroup enum values (alphabetically sorted): ARC_MODE, IO, LATHE, LATHE_CYCLE, OVERRIDES, PATH_CONTROL, PROBING, SPINDLE_MODE, SPINDLE_SYNC, STATE
• Added corresponding sort-order entries for all new groups in GROUP_SORT_ORDER

src/databases/dialects/LinuxcncGCodeCommandDatabase.ts — 40 new G-codes:

• Motion / spline: G5 (Cubic Spline), G5.1 (Quadratic B-Spline), G5.2 (NURBS Add Control Point), G5.3 (NURBS Execute)
• Lathe modes: G7 (Diameter Mode), G8 (Radius Mode)
• Extended plane selection: G17.1 (UV), G18.1 (UW), G19.1 (VW)
• Predefined position store: G28.1, G30.1
• Spindle sync: G33 (Spindle Synchronized Motion), G33.1 (Rigid Tapping)
• Probing: G38.2, G38.3, G38.4, G38.5
• Dynamic compensation: G41.1, G42.1 (dynamic cutter comp), G43.1 (dynamic tool length), G43.2 (additional tool length)
• Coordinate commands: G52 (Local Offset), G53 (Machine Coordinates), G59.1–G59.3 (WCS 7–9)
• Path control: G61 (Exact Path), G61.1 (Exact Stop), G64 (Path Blending)
• Lathe cycles: G70 (Finishing), G71 (Rough Turning), G72 (Facing), G76 (Threading)
• Canned cycles: G73 (Chip Break Drilling), G74 (Left-Hand Tapping)
• Arc center mode: G90.1, G91.1
• G92 variants: G92.1 (Clear), G92.2 (Suspend), G92.3 (Restore)
• Feed / spindle modes: G93 (Inverse Time Feed), G96 (Constant Surface Speed), G97 (Constant RPM)
• Updated G10 description to cover all L-word variants (L0, L1, L2, L10, L11, L20)
• Updated G87/G88 descriptions to note they are not implemented in LinuxCNC

src/databases/dialects/LinuxcncGCodeCommandDatabase.ts — 20 new M-codes:

• Spindle: M19 (Orient Spindle)
• Overrides: M48 (Enable), M49 (Disable), M50 (Feed Override), M51 (Spindle Override), M52 (Adaptive Feed), M53 (Feed Hold)
• Program/tool: M60 (Pallet Change Pause), M61 (Set Current Tool)
• I/O: M62–M65 (digital output on/off, sync/immediate), M66 (Wait On Input), M67/M68 (analog output sync/immediate)
• Modal state: M70 (Save), M71 (Invalidate), M72 (Restore), M73 (Save + Auto-Restore)

Testing

• All existing tests pass (npm test — 1389 tests, 83 suites, all green)
• Build succeeds (npm run build)
• New tests added — not applicable; all additions are pure data entries with no branching logic, consistent with the pattern used throughout the database

Checklist

• Code follows the project's style guidelines
• Self-review completed
• Documentation updated (CHANGELOG)
• No new warnings generated
• Type checking passes (enforced by tsc --noEmit in the pre-commit hook)
• Build succeeds (npm run build)

Additional Notes

The CommandGroup enum is now sorted alphabetically. The GROUP_SORT_ORDER record requires all enum values as keys (enforced by TypeScript's Record<CommandGroup, string> type), so the compiler would catch any missing entries.