chore(main): release 3.0.0

[github-actions]

🤖 I have created a release beep boop

3.0.0 (2026-09-24)

⚠ BREAKING CHANGES

• remove semantic_enrichment and semantic_provider_mode Rust fields and the retired CLI flags. Existing JSON/config keys remain readable through unknown-field handling; graph and storage compatibility is unchanged.

Bug Fixes

• isolate MCP clients and bound abandoned hook work (#123) (8c3bcf3)
• recover MCP sessions and serialize hook cache delivery (#125) (3fc635f)
• release: publish verified merge commits and resume blocked releases (#127) (4594f38)

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