🤖 refactor: default SSH acquireConnection to wait

[ammar-agent]

Summary

• Make SSH backoff non-catastrophic by default: SSHConnectionPool.acquireConnection() now waits through backoff (bounded) instead of throwing immediately.
• Preserve herd protection semantics (singleflight probe + backoff schedule) while improving user-facing reliability.
• Remove SSH-only wait knobs from ExecOptions to avoid runtime API disparity; SSHRuntime always goes through the pool.

Behavior

• Default: acquireConnection(config) waits through backoff for up to 2 minutes.
• Opt-in fail-fast: acquireConnection(config, { maxWaitMs: 0 }).

Notes

• Workspace init/sync still emits progress via onWait for the preflight step, but the waiting policy now lives in the pool.

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Generated with mux • Model: openai:gpt-5.2 • Thinking: xhigh

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