[spec-extractor] Re-verify package specifications for parser, repoutil, semverutil, sliceutil

[github-actions]

Package Specification Updates

This PR re-verifies README.md specifications for the following round-robin selected packages. All four already had accurate, source-verified specifications from prior runs; this run confirmed no public-contract drift and updated the Source Synchronization note.

Package	Status	Exported Symbols
parser	Re-verified (no changes needed)	Large multi-file package covering frontmatter, imports, schema validation, GitHub URL handling
repoutil	Re-verified (no changes needed)	2 functions (SplitRepoSlug, NormalizeRepoForAPI)
semverutil	Re-verified (no changes needed)	8 functions, 1 type (SemanticVersion)
sliceutil	Re-verified (no changes needed)	9 generic functions

What Changed

• Compared each existing README.md against current exported symbols, source files, and recent git history (last 30 days only touched internal schema_suggestions.go refactoring in parser, no public API impact).
• No public-contract deltas were found for any of the 4 packages — all documented types/functions/signatures still match source.
• Updated the Source Synchronization note in each README with a 2026-08-14 re-verification date.

Extraction Method

• Source code analysis of exported symbols, types, and constants (pre-collected via setup step)
• Package doc comment extraction
• Dependency graph analysis
• Recent git history diff review

Round-Robin State

• Packages processed this run: parser, repoutil, semverutil, sliceutil
• Rotation last_index: 8 → 12
• Total packages: 20

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• expires on Aug 17, 2026, 1:53 AM UTC-08:00