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The live dashboard WebSocket sidecar lazily import()-ed the SSE auth module inside the connection handler, only on the API-key path. That cold import pulls in hundreds of transitive modules and takes ~7s under tsx, blocking the single-threaded event loop. The first API-key WebSocket connection therefore stalled the loop long enough that any connection arriving in that window — e.g. a same-origin cookie client — could not complete its handshake and timed out. This was deterministic, not an "env flake": the boot test fires an API-key connection immediately followed by a cookie connection, so the cookie connection always raced the cold import and timed out (reproduced 3/3 locally and red on every CI run; proven via instrumented probes — reversing the order or warming the module first makes both connections open in ~20ms). Fix: - Memoize the auth-module import and warm it once at startup (before listen), so connection handling never pays the cold-import cost. Real improvement: the first API-key client no longer stalls the event loop for concurrent clients. - Relocate the boot test from tests/unit/cli to tests/integration. It spawns a real subprocess + WS server + SQLite (~9-11s); under the unit suite's --test-concurrency=20 it contended for CPU and destabilized the shard. The serial integration runner is its correct home; it still guards #4004's cookie-parse fix on every PR via the integration CI job. - Bump the test's startup/overall timeouts to absorb the eager auth warm. Makes `npm run test:unit` deterministically green (the only remaining unit red). Validated: relocated test 3/3 green via the integration runner (was 3/3 red); typecheck:core + eslint clean; confirmed it no longer matches the test:unit glob and does match tests/integration/*.test.ts.