Handle auth timestamps and SSH ControlMaster handoff

[ashvinnihalani]

What Changed

• Accept ISO string timestamps in auth contract schemas
• Treat zero-exit SSH ControlMaster handoff as a live tunnel

Why

• ISO formatting parsing was just a type guard, not a parsing transformation
• Control master is a performance optimization required for Corporate machines behind firewalls/proxy.

UI Changes

N/A

Checklist

• This PR is small and focused
• I explained what changed and why
• [N/A] I included before/after screenshots for any UI changes
• [N/A] I included a video for animation/interaction changes

Note

Handle SSH ControlMaster handoff and fix auth timestamp parsing

• Auth contract schemas in packages/contracts/src/auth.ts change all DateTimeUtc timestamp fields to DateTimeUtcFromString so that string-encoded UTC datetimes are correctly parsed from API responses.
• SSH tunnel readiness check in packages/ssh/src/tunnel.ts now accepts any HTTP response (not just 2xx) as a signal that the service is ready.
• An SSH process that exits with code 0 and no stderr is now treated as a ControlMaster handoff: the tunnel is kept alive rather than surfacing an error.
• Behavioral Change: auth schemas now expect string input for datetime fields; any upstream code passing Date objects directly will fail validation.

^{Macroscope summarized d69eb1f.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

Changes to auth contract schemas (packages/contracts/src/auth.ts) require human review per auth-sensitivity guidelines. Additionally, SSH tunnel probe logic changes alter runtime behavior by removing HTTP status code validation.

^{You can customize Macroscope's approvability policy. Learn more.}