feat: v2.1.0 — parser refactor, unified publish, and QoL improvements

[carlos-alm]

Summary

• Parser refactor: split monolithic parser.js extractors into per-language files under src/extractors/
• Unified publish pipeline: consolidate dev + stable publish into a single publish.yml workflow with automatic channel detection
• codegraph stats command: new CLI command for graph health overview (node/edge counts, language breakdown, staleness)
• Native engine hardening: normalize import paths, throw on explicit --engine native when addon unavailable, JS-side path.normalize() defense-in-depth
• Registry improvements: TTL-based pruning, auto-prune stale entries, skip temp dir registration, test isolation via CODEGRAPH_REGISTRY_PATH
• Embedding regression CI: real-model integration test with dedicated weekly workflow
• Worktree workflow hooks: guard-git.sh and track-edits.sh for parallel session safety
• Windows compatibility: replace jq with node in hooks
• Competitive analysis: expanded from 21 to 135+ tools
• v2.1.0 CHANGELOG added

Test plan

• Full test suite passes
• codegraph stats produces correct output on a real repo
• publish.yml triggers correctly for both dev (push to main) and stable (release) channels
• Embedding regression workflow runs on schedule
• Worktree hooks enforce parallel session safety rules

[greptile-apps]

Greptile Summary

This PR adds v2.1.0 release notes to CHANGELOG.md, documenting work already merged to main. The CHANGELOG accurately captures the parser refactor (splitting extractors into src/extractors/), unified publish workflow consolidation, new codegraph stats command, native engine hardening, registry improvements, embedding regression CI, worktree workflow hooks, Windows compatibility fixes, and expanded competitive analysis.

All 20 commit references were verified to exist in the repository history, and spot-checks confirmed the documented features are present in the codebase (extractors directory exists, stats command is in src/cli.js, unified publish.yml workflow is in place).

This is a documentation-only change with no code modifications.

Confidence Score: 5/5

• This PR is completely safe to merge with no risk
• Score reflects documentation-only change (CHANGELOG.md) with verified commit references and no code modifications. All 20 commits referenced exist in history, spot-checks confirm documented features are present, and CHANGELOG format follows commit-and-tag-version conventions correctly.
• No files require special attention

Important Files Changed

Filename	Overview
CHANGELOG.md	Added comprehensive v2.1.0 release notes documenting parser refactor, unified publish workflow, stats command, and various improvements

_{Last reviewed commit: a6205b0}

[greptile-apps]

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