Fix dev-db socket server slot leak and add a wedge watchdog

[RhysSullivan]

Kills the last recurring CI e2e flake family: mid-shard the cloud dev DB stops answering new connections (every later test dies with cloud signIn: callback set no session (500) / CONNECT_TIMEOUT 127.0.0.1:<db-port>), most recently in run 32897502744 (cloud 6of16).

Two changes:

• Slot leak in the patched pglite-socket server. A server-initiated teardown (the idle backstop) detaches the socket after removing its listeners, so the server's close bookkeeping never runs and the reaped handler stays in the handlers set forever — one maxConnections slot burned per reap, until every new connection is answered with "Too many connections" while the process, port, and PGlite are all healthy. The handler is now dropped when it dispatches its terminal error. Regression test: reaped handlers release their connection slots (fails against the unpatched server).
• Wedge watchdog in dev-db. Each front-end wedge so far has found a new path, and one wedge fails every remaining test in the shard. dev-db now probes itself the way the app connects (fresh TCP + startup + select 1); after 3 consecutive failures it logs the server's stats to the boot log, swaps in a fresh socket server on the same PGlite (state lives in PGlite; the front-end is stateless), and exits non-zero if restarts don't restore service so the boot supervisor reports an attributable cause instead of minutes of anonymous timeouts.

Checks: lint, typecheck, dev-db-socket-concurrency.node.test.ts (6/6), manual watchdog exercise (healthy boot silent; forced wedge → 3 probe failures → stats dump → bounded restarts).

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