Classify CPU-limit Durable Object resets as retryable

[RhysSullivan]

Problem: two Durable Object platform failures escape the platform-error classifier and fall out of the MCP handler as unhandled 500s instead of actionable protocol errors. One is the per-invocation CPU ceiling, which throws a plain Error reading "Durable Object exceeded its CPU time limit and was reset." The other is a storage backend fault raised while the object is being brought up, which reads "Internal error while starting up Durable Object storage caused object to be reset; reference = " — the existing bare-blip fragment internal error; reference = cannot match it, because the runtime interposes its own description between "internal error" and the reference id.

Fix: add both messages to the classifier as transient platform resets (cpu_limit, startup_internal_error), so the handler answers 503 with Retry-After on the same session id. Both fragments deliberately avoid the parts of the phrasing the runtime is known to vary, and the startup entry stays separate from the bare blip rather than widening that fragment, which would collapse every referenced error into one opaque bucket. The sibling memory-limit reset is deliberately left unclassified — the runtime attributes it to the application, and a retry reproduces it.

Testing: extended the classifier unit suite with both messages, asserting for each that it classifies transient and that the classify-to-envelope seam renders the retryable 503, plus that the startup fault and the bare blip stay distinct kinds. Neither reset can be provoked on the dev stack, so this follows the same declared exception as the other unreachable patterns. Mutation-checked by neutralizing each new pattern (only its own tests fail, the rest pass). typecheck, lint, format:check pass, and e2e cloud/mcp-destroyed-session-envelope still passes.

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