fix(runtime): proxy MCP before opening local stores

[ScriptedAlchemy]

Summary

• choose the managed-daemon proxy before tracedecay serve resolves or opens project/global stores
• delegate config-gated git auto-init to the daemon and drop late-race local handles before proxying
• keep one daemon connection per request, so a long-lived stdio MCP process reconnects across socket/PID replacement without replaying requests after a write
• fix the Unix-only daemon drain test import that broke Windows test compilation

Compatibility

No old tool-schema fallback is added. Existing stdio MCP processes can reconnect for already-known calls; hosts must start a new MCP session to refresh a cached tools/list after tool-schema changes.

Tests

• cargo test --lib daemon::tests::long_lived_proxy_reconnects_after_daemon_socket_rebind -- --exact
• cargo test --test mcp_suite mcp_cli_serve_test::serve_with_reachable_daemon_proxies_before_opening_explicit_project -- --exact
• restart-window, initialize-root routing, and disconnect regression tests
• cargo check --tests --target x86_64-pc-windows-gnu
• cargo clippy --all-targets -- -D warnings
• cargo fmt --all -- --check

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Latest commit: 54c9d7b

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