`_sync_anthropic_entry_from_credentials_file` only checked whether the
refresh_token in ~/.claude/.credentials.json differed from the pool
entry's refresh_token. This missed the case where the CLI performs a
silent access-token re-issue — returning a new access_token alongside
the *same* refresh_token. The pool entry's stale bearer token was never
updated, causing 401 errors on every request until the exhausted-TTL
(5 min) expired.
Bring this function to parity with its Codex and xAI OAuth siblings:
- Check either access_token *or* refresh_token changed (dual-field guard).
- Use `file_X or entry.X` fallbacks so a partial file can't blank a field.
- Clear all six status/error fields on sync (last_error_reason,
last_error_message, last_error_reset_at were previously omitted),
ensuring an exhausted entry becomes available immediately.
Spotted via parity review against commit 569bc94b5 which fixed the same
pattern in `_sync_nous_entry_from_auth_store`.
EloquentBrush0x
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