P1 bug: sin-code daemon help/readiness can hang and lacks bounded diagnostics

[Delqhi]

Observed behavior

A bounded invocation of sin-code daemon --help did not return during the orchestration audit. A help/readiness path must never initialize providers, databases, networks or long-running loops in a way that can block indefinitely.

Required implementation

• Reproduce with the current release and main.
• Ensure --help is side-effect free and completes immediately.
• Add sin-code daemon doctor or equivalent readiness diagnostics with bounded timeouts.
• Report database, provider, verify-command and lease-loop readiness without exposing secrets.
• Add regression tests for help, invalid configuration and unavailable dependencies.

Acceptance criteria

• sin-code daemon --help completes within one second in CI without credentials or network.
• Readiness checks have explicit per-probe and global deadlines.
• Failure output identifies the blocked subsystem and remediation.

[Delqhi]

Audit update: the installed v3.25.0 command currently completes sin-code daemon --help in 0.201s; goal --help and auto --help complete in under 0.04s. The prior timeout is not currently reproducible. Keep this issue focused on a regression test ensuring help is side-effect free plus bounded daemon doctor readiness probes.