[spec-extractor] docs: document ValidateExecutablePath and ResolveExecutablePath in fileutil README

[github-actions]

Package Specification Updates

This PR updates the README.md specification for the following package:

Package	Status	Exported Symbols
fileutil	Updated	9 functions, 0 types
envutil	Verified (no change)	3 functions, 0 types
gitutil	Verified (no change)	8 functions, 0 types, 1 variable
logger	Verified (no change)	10 functions/methods, 2 types

What Changed

• fileutil: pkg/fileutil/executable.go exports ValidateExecutablePath and ResolveExecutablePath, which were missing from README.md. Added both to the Public API table, added behavioral contracts (executable-bit check skipped on Windows, empty-name and PATH-lookup error handling), added usage examples, and noted the executableLog logger in Thread Safety and Design Decisions.
• envutil, gitutil, logger: source-verified against existing README.md files — no discrepancies found, no changes made.

Extraction Method

• Source code analysis of exported symbols, types, and constants (go/ast-equivalent grep-based extraction over non-test .go files)
• Package doc comment extraction
• Dependency graph analysis (import lists)
• Diff against existing README.md content to detect undocumented symbols

Round-Robin State

• Packages processed this run: envutil, fileutil, gitutil, logger
• Next packages in rotation: continues from rotation index 8
• Total packages: 20
• Coverage: 12/20 packages verified or updated to date (cumulative across runs)

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[github-actions]

🎉 This pull request is included in a new release.

Release: v0.84.1