feat(resolve): infer method-call receiver types across languages and prefer same-file targets

[sunerpy]

Summary

Round 5 (final) of the upstream colby 1.1.2→1.2.0 port. Method calls through a variable or typed parameter previously only resolved for C++ (and Java/Kotlin fields); every other language dropped them, so callers/impact couldn't follow obj.method().

• #1108 — generalize local-variable receiver inference (const x = new T(), x = T(), x := T{}, etc.) across TypeScript, JavaScript, Python, Java, C#, Kotlin, Swift, Go, Rust, Dart, Scala, PHP.
• #1125 — typed-parameter inference (fn(lg: Logger), TS generics repo: Repository<User> → outer type).
• #1112 — recognize Lua/Luau :, R $, Pascal . call separators.
• #1079 — prefer the call site's own file when several same-named methods exist across files, in the three method-call resolution paths that lacked it.

Every inference is validated via resolve_method_on_type, so a wrong type guess yields no edge rather than a wrong one. The C++ (infer_cpp_*) and Java/Kotlin (infer_java_field_*) paths are preserved.

Golden change (upstream-aligned)

The mini golden's 3 local-variable instance-method edges rise from confidence 0.8 → 0.9, matching upstream colby 1.2.0's receiver-inference path (name-matcher.ts matchMethodCall resolves local-var receivers at 0.9; the old 0.8 came from an older upstream reference db). Regenerated colby.db + edges.json accordingly — only those 3 confidence values changed; no edge lost/added/re-targeted. Other fixtures (godot/ruby/mcp) unchanged.

Verification

• make ci green (fmt + clippy + full test incl. golden equivalence + guardrail)
• TDD: per-language behavioral tests + negatives (ambiguous/no-type → no edge) + #1079 same-file partition tests + branch-coverage tests
• Determinism verified: no HashMap/HashSet iteration into resolved-edge output order
• cross_file_resolution_matches_upstream_golden_edges + upstream_db_is_self_equivalent_to_mini_golden both pass with the 0.9 golden

[codecov]

Codecov Report

❌ Patch coverage is 99.51613% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/codegraph-resolve/src/name_matcher.rs	99.51%	6 Missing ⚠️

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   95.52%   95.62%   +0.09%     
==========================================
  Files         115      115              
  Lines       53276    54670    +1394     
==========================================
+ Hits        50894    52280    +1386     
- Misses       2382     2390       +8     

Files with missing lines	Coverage Δ
crates/codegraph-resolve/src/name_matcher.rs	97.15% <99.51%> (+1.04%)	⬆️

... and 3 files with indirect coverage changes

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