test: 9 pre-existing test failures in full suite, unrelated to v0.9.7 changes

Bắt đầu bằng cách chạy các test MCP được nêu, đặc biệt là test/mcp/headers.test.ts và test/mcp/httpapi.test.ts, độc lập và trong toàn bộ bun test suite; kiểm tra các header assertion được báo cáo và các test quét MCP để xác thực release. Sau đó so sánh các lỗi PostgreSQL và subprocess trong các điều kiện môi trường và tải phù hợp. Được xem là hoàn tất khi các lỗi MCP mang tính xác định đã được sửa hoặc fixture của chúng đã được cập nhật, còn các test phụ thuộc vào môi trường hoặc contention đã được sửa một cách đáng tin cậy hoặc được gated.

Found while running the full bun test suite (12,309 tests) as part of the v0.9.7 release gate.

9 failures, none in files touched by v0.9.7 (verified via git diff v0.9.6..HEAD --stat against each failing test's source and test file — zero overlap):

1. test/mcp/httpapi.test.ts — "serves status endpoint"
2. test/mcp/headers.test.ts — 5 failures: "headers are passed to transports when oauth is enabled", "...when oauth is explicitly disabled", "OAuth is auto-disabled when an explicit Authorization header is present", "OAuth is auto-disabled when Authorization is supplied via headersCommand", "headersCommand overrides a static header that differs only in casing". Reproduces deterministically in isolation (not resource contention) — asserts call.options.requestInit?.headers equals a specific object, gets undefined. Looks like a real bug in MCP transport header wiring, or a test fixture drift — needs investigation, but pre-dates this release (src/mcp/ and test/mcp/ have zero diff between v0.9.6 and v0.9.7).
3. test/release-validation/mcp-datamate-893.test.ts (or its -codex sibling) — "recursive project scan ignores vendored mcp.json files before they can auto-connect"
4. test/altimate/drivers-e2e.test.ts — "PostgreSQL Driver E2E" — beforeEach/afterEach hook timeout. Almost certainly requires a live local Postgres instance not present in this sandboxed environment; likely environment-dependent, not a code bug.
5. test/cli/run/run-process.test.ts — "mid-stream LLM error still exits 0 today (contract lock-in)" — spawns a real opencode run subprocess; timing/resource-contention shaped failure under full-suite parallel load (child_process exit handling in the trace).

Deferred from v0.9.7 because none of these touch this release's diff. Needs triage to split: (a) genuine MCP header-wiring regression [items 2-3, deterministic] vs (b) environment/resource-contention flakes [items 1, 4, 5] that may need environment fixtures or to be marked skipIf(!hasPostgres)-style.

Per this project's own rule against flaky/resource-contention tests, item set (b) especially should either get a real fix or be gated behind an environment check rather than silently failing in CI/full-suite runs.