fix(hooks): honor lifecycle quiescence

[ScriptedAlchemy]

Summary

• gate every hook before startup/config/store work with a non-inherited shared lifecycle lease
• silently quiesce and drain piped hook input while update or migration holds exclusive ownership
• skip agent-install maintenance for all hook commands

Verification

• cargo test --test hooks_lsp_suite --locked hook_lifecycle_lease_test
• cargo test --lib --locked lifecycle_lease::tests
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo fmt --all -- --check
• git diff --check

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Latest commit: b2fd149

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[ScriptedAlchemy]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Drain Claude stdin hooks while quiescing

Claude's hooks reference says command hooks receive the event JSON on stdin, and this repo wires PreToolUse, UserPromptSubmit, and Stop as command hooks in plugin/hooks/hooks-claude.json. Classifying these variants as NoInput makes the new Busy path return without draining them; when an update/migration holds the exclusive lifecycle lease and Claude submits a large prompt/stop payload, Claude can see a broken pipe or hook failure instead of the intended fail-open quiescence. Please treat these as Stdin for the busy drain even if the dispatcher ignores the payload.

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