fix(readiness): preserve gateway probe error detail

[politerealism]

Outcome

Before: a managed-gateway or externally-supervised attachment probe failure always reported the same generic message ("...could not be collected safely"), regardless of what actually failed. After: the caught error's message is included, sanitized through the existing redaction helpers.

Reason

This made a real bug (#10984 — Docker-hardcoded gateway observation breaking Podman onboarding) very hard to diagnose: onboarding reported three failed capabilities with no indication it was actually a docker: command not found failure underneath. Finding the cause required reading source.

Related issues

Fixes #10985. Relates to #10984.

Changes

• src/lib/readiness/gateway.ts: bind the caught error in both the managed-gateway observation catch and the externally-supervised attachment-probe fallback catch. Added a probeFailureDetail() helper to render the error as text without assuming its shape, and route it through the existing safeOwnerFailureText/safeReportText redaction pipeline already used for every other failure/evidence string in this file.
• src/lib/readiness/gateway.test.ts: two new tests confirming the real error message surfaces in the projection for both catch paths, and that state-dir redaction still applies to the externally-supervised path.

Verification

• npx vitest run src/lib/readiness/gateway.test.ts — 12 passed (10 existing + 2 new)
• npm run typecheck:cli — clean
• npm run test:changed — 121 passed, no regressions

Summary by CodeRabbit

• Bug Fixes

  • Readiness reports now include sanitized details when gateway observation or external attachment checks encounter unexpected errors.
  • External probe error messages omit private state directory information while retaining relevant gateway status placeholders.
  • Error details are consistently presented in readiness projections without exposing sensitive local paths or implementation-specific information.

• Tests

  • Added coverage verifying that unexpected errors are included and sensitive information is correctly sanitized in readiness reports.

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• src/lib/readiness/gateway.test.ts

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• src/lib/readiness/gateway.test.ts

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📝 Walkthrough

Walkthrough

Gateway readiness checks now preserve sanitized details from managed gateway and external attachment probe errors. Tests verify serialized readiness projections and private state path redaction.

Changes

Gateway readiness error reporting

Layer / File(s)	Summary
Preserve and validate gateway failure details src/lib/readiness/gateway.ts, src/lib/readiness/gateway.test.ts	Gateway observation catches normalize and sanitize error details. Tests cover managed gateway errors, external probe errors, and private state directory redaction.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 90eaf

Gateway readiness failures now provide sanitized error details, improving diagnosis without exposing the tested private state path. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving gateway probe error details in readiness failures.
Linked Issues check	✅ Passed	The changes satisfy issue #10985. Both gateway observation catch paths preserve error details, safely handle unknown thrown values, apply redaction, and include tests for error reporting and state-dir…
Out of Scope Changes check	✅ Passed	All changes are limited to gateway readiness error handling and related tests. They support the linked issue objectives and do not introduce unrelated scope.

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Actionable comments posted: 1

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Inline comments:
In `@src/lib/readiness/gateway.test.ts`:
- Line 215: Update the rejected error configured by probeAttachment in the
readiness test to include owner.stateDir in its message, while preserving the
existing connection-refused context. Keep the assertion against the public
readiness projection so it verifies that safeOwnerFailureText redacts the
state-directory path from the caught error.

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Reviewing files that changed from the base of the PR and between 3d75441 and 805c762.

📒 Files selected for processing (2)

• src/lib/readiness/gateway.test.ts
• src/lib/readiness/gateway.ts

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[wscurran]

✨ Thanks for the fix. This restores useful error detail for onboarding gateway probe failures, which will help diagnose container runtime issues like the Podman case in #10984.

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Related open issues:

• #10985 Generic catch in gateway readiness checks swallows the real error behind "could not be collected safely"
• #10984 observeManagedGateway() hardcodes Docker CLI calls, breaking native Podman onboarding after #10900

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[cjagwani]

Thanks for improving the gateway failure detail and adding redaction coverage. #11014 now covers the same issue across both managed and externally supervised paths, with the broader credential redaction checks we need. To keep one implementation moving, we are going to continue with #11014 and close this PR. We appreciate the contribution.