docs: add changelog for v0.6.0

Author: huntharo

CHANGELOG.md

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+# Changelog
+
+## v0.6.0 - 2026-03-12
+
+### Highlights
+
+- Added a jump-to-thread prompt in the TUI so maintainers can move directly to a specific thread.
+- Moved TUI refresh work into background jobs so the interface stays responsive during updates.
+- Added a bundled release skill to make tag-driven GitHub releases easier to plan and publish. Thanks @huntharo (#12)
+
+### Performance
+
+- Reduced the amount of work needed to build exact cluster edges for larger datasets.
+- Parallelized exact cluster edge building so local analysis finishes faster.
+
+### Fixes
+
+- Fixed the PR comment workflow permissions so automated PR comments can post reliably. Thanks @huntharo (#9)
+
+### Docs
+
+- Linked the docs directly to embeddings pricing details for quicker operator lookup.
+- Documented how to trace a thread back to its cluster JSON output.
+- Clarified the ghcrawl skill CLI guidance for local workflows. Thanks @huntharo (#6)
+
+### Internal
+
+- Added a benchmark for cluster performance coverage. Thanks @huntharo (#8)
+- Refreshed environment-related repository setup.