Fix mount daemon cloud refresh token rotation race

[khaliqgant]

Summary

• Retry cloud session refresh once with freshly reloaded disk credentials after refresh-token auth rejection.
• Reuse a fresh on-disk cloud access token when another CLI already rotated credentials.
• Treat unrecovered refresh endpoint 401/403 as the existing re-login/degraded sentinel instead of a non-fatal refresh blip.
• Add regression coverage for stale in-memory refresh tokens racing with rotated disk credentials.

Tests

• go test ./cmd/relayfile-cli -run 'TestRefreshCloudCredentials|TestMountOnceRejoinsWorkspaceTokenAfterUnauthorized|TestStatusSurfacesDegradedStallReason'
• go test ./cmd/relayfile-cli

Closes #178

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 43c9dc72-11cc-470a-8412-fd30d7dc2766

📥 Commits

Reviewing files that changed from the base of the PR and between 0762c7e and 662f9ad.

📒 Files selected for processing (2)

• cmd/relayfile-cli/main.go
• cmd/relayfile-cli/main_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-178-auth-token-rotation

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[github-actions]

Relayfile Eval Review

Run: .relayfile/evals/runs/2026-05-21T10-50-06-576Z-HEAD-provider
Mode: provider
Git SHA: d866e31

Passed: 4 | Needs human: 0 | Reviewable: 0 | Missing output: 0 | Failed: 0 | Skipped: 0

Human Review Cases

No reviewable human-review cases captured Relayfile output.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.