fix(coding-agent): run OAuth refresh outside the auth.json file lock

[veerareddyvishal144]

Fixes #999.

What was broken

refreshOAuthTokenWithLock awaited the provider's token refresh (an HTTP round-trip) inside the withLockAsync callback, holding the auth.json file lock across the network call. This blocked other processes/threads from reading or refreshing credentials, causing hangs and stale auth state.

Fix

• Take snapshot under lock, release lock before network request.
• Re-acquire lock only to merge/persist refreshed credential (race-safe vs concurrent refresher).
• Adds regression test 999-oauth-refresh-lock.test.ts.

Replaces #1001 (closed in Aug 15 backlog sweep, not merged).

Fixes #999

Note

Move OAuth token refresh outside the auth.json file lock in AuthStorage

• Rewrites AuthStorage.refreshOAuthTokenWithLock to a two-phase lock protocol: read expired credentials under lock, release it, run provider.refreshToken outside the lock, then reacquire the lock to persist.
• Adds conflict detection: after reacquiring the lock, compares cred.refresh and cred.expires against the snapshot; if another process wrote fresher credentials mid-refresh, the stale result is discarded and the freshest credentials are returned.
• Removes the getOAuthApiKey import and replaces the old oauthCreds-map delegation with direct provider.refreshToken calls and explicit merge/persist logic.
• Adds regression tests in 999-oauth-refresh-lock.test.ts verifying the lock is not held during refresh and concurrent fresher writes are preserved.
• Behavioral Change: the lock is now only held during read/parse and write/persist, not during the network round-trip; callers receive the freshest stored credentials when a concurrent writer wins.

^{Macroscope summarized e40b5fd.}

[github-actions]

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