Fix two CI e2e flakes: stylesheet-count race and dev-db queue wedge

[RhysSullivan]

Three independent flakes, all seen on PR #1648's CI run and both reproducible on main.

Artifacts stylesheet-count race (E2E cloud shard 2)

artifacts.test.ts asserted document.styleSheets.length is unchanged after opening an artifact. The count moves on its own in dev: TanStack Start swaps its route-styles <link> as route matches settle, and the swapped-in link only counts once loaded, so the assertion raced it (expected 3 to be 4).

The shell's tokens now deliberately mirror the console's, so no token name or value can identify its stylesheet either. The shell's compiled stylesheet now declares a provenance marker (--mcp-apps-shell-stylesheet: 1 on :root), and the test asserts the computed marker is present inside the shell document and absent from the console document — deterministic in both directions.

dev-db socket wedge (E2E cloud shard 5 cascade)

The cloud signIn: callback set no session (500) cascade: PGLiteSocketServer's query queue returned out of its drain loop when a query rejected at the JS level, leaving its processing flag latched true. After one such throw nothing was ever dequeued again — in-flight requests hung, new connections' startup packets sat unanswered (CONNECT_TIMEOUT), and the stack was bricked for the rest of the run. The patch now rejects the one entry, drops pipeline affinity, and keeps draining.

Also in the patch:

• The idleTimeout backstop only reaps connections actually holding queue affinity (open pipeline or transaction). It used to kill any 30s-idle connection — the resting state of every healthy postgres.js pool held by a long-lived scope — which raced live queries into sporadic write CONNECTION_ENDED 500s.
• detach() rejections from error/close handlers no longer become unhandled rejections.

Regression tests in dev-db-socket-concurrency.node.test.ts cover the wedge (fails with CONNECT_TIMEOUT on the unpatched code), idle-at-rest survival, and the backstop still reaping a client stalled mid-pipeline.

Verified: lint, typecheck, mcp-apps-shell package tests (82), and vitest run --project cloud scenarios/artifacts.test.ts (4 scenarios) all pass locally.

tool-invoker discovery-shape timeout (Test job)

describes built-in discovery tool shapes that accept their runtime output runs three sandboxed describe.tool round-trips plus three type-checks of the described contracts under vitest's 5s default and timed out at 5.6s on a loaded runner. Raised to the { timeout: 10000 } ceiling the file's other sandbox-heavy tests already use.

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