Fix test noisiness

[Muhammad-Bin-Ali]

Summary

Fixes noisy test output in the agents suite — DNS lookup failures and Durable Object invalidation errors that obscured real failures.

Changes

DNS lookup failures (eliminated)

• tests/agents/mcp.ts — Mock connectToServer on TestHttpMcpDedupAgent to prevent real network calls to mcp.example.com
• tests/mcp/client-manager.test.ts — Mock connectToServer in the restore+wait integration test to prevent calls to test.example.com

Durable Object invalidation (eliminated)

• src/index.ts — _scheduleNextAlarm() now calls deleteAlarm() when no schedules remain. Previously, cancelling the last schedule left an orphaned workerd alarm.
• tests/schedule.test.ts — Cancel all interval schedules at end of tests (9 tests were leaving alarms active)
• tests/message-handling.test.ts, tests/basepath.test.ts, tests/observability.test.ts — Add closeAndWait to WebSocket teardown so close handlers finish before module transitions
• tests/mcp/transports/streamable-http.test.ts — Cancel unclosed SSE readers at end of tests

Remaining stderr noise

Intentional (tests exercising error paths, all have matching assertions):

• state.test.ts — state validation rejection, duplicate hook guard
• session/provider.test.ts — input validation (negative limit/offset)
• workflow-error-reporting.test.ts — workflow throw/reject/error-reporting paths

Unintentional (miniflare mock limitations, no assertions):

• workflow.test.ts — Engine was never started / instance.not_found from miniflare's workflow binding when tests write to SQLite without creating real workflow instances

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Latest commit: 3d35179

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commit: 3b90550