feat(go): Add Go version detection and stdlib loader init (PR-05)

[shivasurya]

Description

• Add DetectGoVersion(projectPath) with priority chain: go.mod → .go-version → go.work → default "1.21"
• Add normalizeGoVersion to strip patch component: "1.26.0" → "1.26"
• Add InitGoStdlibLoader(reg, projectPath, logger) wiring GoStdlibRegistryRemote into GoModuleRegistry.StdlibLoader
• Graceful degradation on manifest fetch failure (StdlibLoader remains nil; downstream code nil-checks)
• stdlibRegistryBaseURL package var allows test override without modifying production logic
• 25 tests, 100% coverage on go_version.go, 0 lint issues, all packages pass

Checklist

• Tests passing (gradle testGo)?
• Lint passing (golangci-lint run)?

🤖 Generated with Claude Code

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

_{This report is generated by SafeDep Github App}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.25%. Comparing base (4e67d67) to head (cc2624d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
+ Coverage   83.23%   83.25%   +0.02%     
==========================================
  Files         142      143       +1     
  Lines       17660    17697      +37     
==========================================
+ Hits        14699    14734      +35     
- Misses       2421     2422       +1     
- Partials      540      541       +1     

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[shivasurya]

• feat(go): Replace hardcoded stdlib set with GoImportResolver struct (PR-09) #557
• feat(go): Add stdlib metadata to MCP call graph tool responses (PR-08) #556
• feat(go): Close stdlib type inference gap in GetReturnType (PR-07b) #555
• feat(go): Resolve stdlib return types in variable extraction (PR-07) #554
• feat(go): Wire stdlib loader into builder pipeline (PR-06) #553
• feat(go): Add Go version detection and stdlib loader init (PR-05) #552 👈 (View in Graphite)
• feat(go): Add Go stdlib R2 publishing pipeline (PR-04) #551
• feat(go): Add Go stdlib remote registry loader with lazy caching (PR-03) #549
• feat(go): Add Go stdlib extraction tool for registry generation (PR-02) #548
• feat(go): Add Go stdlib registry data structures and types (PR-01) #546
• main

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[shivasurya]

Merge activity

• Feb 25, 3:17 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Feb 25, 3:25 AM UTC: Graphite rebased this pull request as part of a merge.
• Feb 25, 3:25 AM UTC: @shivasurya merged this pull request with Graphite.

[github-actions]

Code Pathfinder Security Scan

No security issues detected.

Metric	Value
Files Scanned	2
Rules	38

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