Fix browser elicitation resume page session lookup

[RhysSullivan]

The cloud resume page looked up the MCP session Durable Object with idFromString, while sessions are created with name-based ids (idFromName). So opening a browser-elicitation approval URL queried a DO that doesn't exist and the page showed "This paused execution is no longer available."

The lookup in apps/cloud/src/auth/handlers.ts now goes through a new shared mcpSessionStub helper, and all other session-DO call sites were migrated to it. A new oxlint rule (executor/no-raw-durable-object-id) flags raw idFromName/idFromString outside the canonical helpers so addressing can't drift again.

e2e coverage in e2e/cloud/mcp-browser-resume-page.test.ts: an API-level scenario (red before the fix with McpExecutionNotFoundError) and a browser scenario that loads the approval page and approves through the UI.

Recording of the browser scenario: https://github.com/UsefulSoftwareCo/executor/blob/elicitation-resume-repro/e2e/recordings/mcp-browser-resume-page.mp4

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commit: 6e7a442