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Triage note: rebase onto current dev conflicts in src/features/background-agent/fallback-retry-handler.{ts,test.ts} due to subsequent background-agent fallback evolution: c0544a7 (defer retry notifications), #7a94cc72b (stabilize parent wakes), #3972 (partInfo.input circuit breaker fallback). Partial coverage of the underlying goal (skip unavailable fallback candidates) was also added via #3982 (delegate-task category fallback honoring) and #3934 (localized balance classification).

To re-land:

1. Rebase onto current dev.
2. Verify what is now still missing on top of fix(delegate-task): honor user fallback_models when category primary is unreachable #3982 + fix(runtime-fallback): classify localized balance failures as quota exhaustion #3934 + fix(model-fallback): add HTTP statusCode check for GLM rate limit fallback #3773 + the partInfo.input changes (likely the per-attempt runtime model catalog check before launching the fallback session in background-agent/fallback-retry-handler.ts).
3. Trim the diff to only that gap, confirm bun test --timeout 30000 is 0 fail.

Closes #3400 still applies once #3402 is rebased + verified. Leaving open.

Closing as obsolete. Current dev already implements the reachability skip in src/features/background-agent/fallback-retry-handler.ts via:

• An isReachable(candidate) check against the connected-provider set (lines ~90-106).
• if (!isReachable(candidate)) { log skip; continue } to skip unreachable fallback candidates.
• isNoOpFallback check that additionally skips candidates that resolve to the same provider+model as the failing attempt.

This achieves the same goal as this PR (skip unavailable fallback candidates instead of attempting them), so the diff would now be a no-op. Closing along with closing #3400 (the linked issue).

Closing as obsolete; the reachability skip is already in HEAD's fallback-retry-handler.ts via isReachable + isNoOpFallback. See triage comment above.