feat(matlab): add first-class MATLAB extraction support

[TPAteeq]

Summary

Adds first-class, deterministic MATLAB extraction for .m files, completing the parser follow-up identified in #1702.

Graphify now content-sniffs .m files and routes them to either MATLAB or Objective-C without confusing MATLAB comments, strings, or function handles for Objective-C syntax. .mm remains unambiguously Objective-C++.

MATLAB extraction runs locally and offline using the dedicated tree-sitter-matlab package. No LLM or network access is required.

What changed

• Added a dedicated MATLAB structural extractor supporting:

  • Scripts and primary/local/nested functions
  • classdef classes and inheritance
  • Properties, access modifiers, events, and enumerations
  • Instance and static methods
  • Ignored ~ parameters with accurate arity
  • +package, nested package, @Class, and private folder conventions
  • File-level and function-scoped imports
  • Function handles, feval, command-form calls, and constructed receivers

• Added conservative call resolution:

  • Distinguishes calls from MATLAB’s ambiguous indexing syntax
  • Resolves same-file, cross-file, imported, package-qualified, and typed-receiver calls
  • Respects nested lexical scope and private-folder visibility
  • Allows project functions to shadow MATLAB built-ins
  • Emits references when a function handle is created and indirect_call only when invoked
  • Avoids resolving bare calls to unrelated class methods

• Hardened MATLAB/Objective-C interoperability:

  • Added explicit language provenance for ambiguous .m files
  • Prevented MATLAB nodes from merging with same-stem native header/implementation nodes
  • Prevented MATLAB classes from polluting Swift, TypeScript, C++, C#, Java, and Objective-C receiver-type indexes
  • Preserved existing C/Objective-C and Swift family boundaries
  • Added namespaced MATLAB class identities for stable cross-language disambiguation

• Updated Graphify integration:

  • MATLAB files participate in hooks, callflow rendering, caching, portable ID remapping, and language-family analysis
  • Agent update instructions now classify .m and .mm changes as code-only updates
  • Regenerated and validated all affected skill artifacts
  • Updated the README, extractor migration table, changelog, dependency lock, and extractor registry

Validation

• 3170 passed, 30 skipped
• 22 focused MATLAB regression tests
• Ruff: passed
• Pyright: passed
• uv lock --check: passed
• Skill generator consistency and monolith round-trip checks: passed
• git diff --check: passed
• Built and installed the wheel in a fresh Python 3.10 environment
• Verified MATLAB extraction from the installed wheel with network socket connections forcibly blocked