feat(providers): offer reconnect for auth-class inference failures

[TheGreatAxios]

Summary

• OAuth 426 upgrade rejections on known-OAuth providers reclassify to credential failure and name the exact one-action command in the transcript
• Failing turns surface an idle-only reconnect offer that opens /connect pre-scoped to the failing kind and profile, with replay-once only when nothing is committed
• Reconnect wins over the provider-switch picker when both arm, with no cascade on dismiss

Verification

• bun run check passes (lint, typecheck, dead-exports, build, guarded suite: 8078 pass, 0 fail)
• New tests: reconnect-recovery, submit precedence, classifier fixtures, pre-scoped connect

Fixes #1295

[TheGreatAxios]

Review · Request changes

The branch classifies reconnectable auth failures and adds a scoped reconnect/replay flow.

Findings

• src/tui/runner/reconnect-recovery.ts:209 — Accepting the reconnect offer replays the failed turn before reconnection succeeds. openReconnect only opens the interactive add-provider surface (lines 264–270), but applyReconnectRecoverySelection immediately arms and delivers the continuation at lines 210–214; the director consumes that message by starting inference, while the operator has not yet completed OAuth. This can repeat the same credential failure behind the open reconnect UI and consumes the one replay. Please trigger the continuation from the successful connect completion callback instead.

bun run check passes on this head (8,031 tests, 0 failures), and git diff --check 1ba2599...057c290b passes.

[TheGreatAxios]

Review follow-up · Fix verified

No findings in fix commit 4ddcf4ec.

Opening the scoped reconnect surface no longer delivers a continuation. The one-shot completion callback delivers replay only after a successful connection, while cancellation, failure, committed attempts, and duplicate completion do not replay. Normal /connect remains callback-free.

Verification: all GitHub checks pass; git diff --check 057c290b..4ddcf4ec passes.

[linear-code]

CL-9792