test: add golden coverage for extension parsers

[justrach]

Summary

Tightens the parser assurance from #322.

This adds per-extension golden outline assertions so the newly covered extensions are validated by their own parsed outline, not only by global findAllSymbols smoke checks.

Coverage added

• .cc: C++ include, class, member-like function, free function
• .mm: #import, Objective-C @interface / @implementation, Objective-C method name, C++ class, C-style function
• .java, .kt
• .svelte, .vue, .astro
• .sh
• .css, .scss
• .sql, .proto
• .f90
• .ll, .mlir, .td

Parser fixes included

• C/C++ parser now recognizes class declarations.
• C/C++ parser now handles #import in addition to #include.
• .mm path now extracts basic Objective-C++ outline symbols: @interface, @implementation, @protocol, and -/+ method names.

Validation

• zig build test
• zig build
• GitHub bench-regression / bench passed

Benchmark notes

The benchmark check passed, but the generated comment is noisy:

• First run: codedb_edit +13.27% flagged; all other tools were within threshold, including codedb_symbol -9.05%.
• Rerun: codedb_edit +13.38% and codedb_symbol +14.24% flagged.

This patch does not touch edit code. The symbol-path change is plausibly due to parser code/test growth increasing the indexed corpus and benchmark variance. Parser-adjacent correctness is covered by the new golden outline tests plus zig build test.

[github-actions]

Benchmark Regression Report

Threshold: 10.00%

Tool	Base (ns)	Head (ns)	Delta	Status
codedb_bundle	475021	484095	+1.91%	OK
codedb_changes	53951	52436	-2.81%	OK
codedb_deps	10667	10735	+0.64%	OK
codedb_edit	5138	5820	+13.27%	FAIL
codedb_find	58814	60868	+3.49%	OK
codedb_hot	96653	102842	+6.40%	OK
codedb_outline	239357	246020	+2.78%	OK
codedb_read	87844	86980	-0.98%	OK
codedb_search	177627	180392	+1.56%	OK
codedb_snapshot	2717323	2689603	-1.02%	OK
codedb_status	215484	204468	-5.11%	OK
codedb_symbol	63940	58154	-9.05%	OK
codedb_tree	74383	68223	-8.28%	OK
codedb_word	70639	66829	-5.39%	OK

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Parse ObjC methods without fixed "- (" spacing

Objective-C allows optional whitespace between the -/+ token and the return-type parentheses, but this check only accepts the exact - ( or + ( prefix. Files that use valid forms like -(void)loadPage (or multiple spaces) will now miss method symbols entirely, which undercuts the new .mm outline coverage introduced here. Parse the leading -/+ first, then trim whitespace before checking for ( so all valid declarations are handled.

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[github-actions]

Benchmark Regression Report

Threshold: 10.00%

Tool	Base (ns)	Head (ns)	Delta	Status
codedb_bundle	482517	486440	+0.81%	OK
codedb_changes	57283	53540	-6.53%	OK
codedb_deps	9430	8893	-5.69%	OK
codedb_edit	5148	5837	+13.38%	FAIL
codedb_find	59068	59473	+0.69%	OK
codedb_hot	98300	100006	+1.74%	OK
codedb_outline	246846	246700	-0.06%	OK
codedb_read	85177	90137	+5.82%	OK
codedb_search	175250	180353	+2.91%	OK
codedb_snapshot	2730379	2769239	+1.42%	OK
codedb_status	209720	206172	-1.69%	OK
codedb_symbol	56787	64871	+14.24%	FAIL
codedb_tree	69482	69782	+0.43%	OK
codedb_word	67343	70676	+4.95%	OK