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gsxdsm 7fc4b439ee FN-8205: fix shared auth credential lock retries

Serialize shared auth credential writes and await durable persistence under contention.

- Replace synchronous auth-file locking with queued asynchronous retries.
- Propagate asynchronous credential mutations through CLI, dashboard, and provider wrappers.
- Cover held-lock persistence, queue recovery, and awaited caller behavior.

Files changed:
 .changeset/fn-8205-auth-lock-retry.md              |   7 ++
 .../cli/src/commands/__tests__/onboard.test.ts     |  17 +++
 .../src/commands/__tests__/provider-auth.test.ts   |  78 ++++++------
 packages/cli/src/commands/onboard.ts               |   2 +-
 packages/dashboard/src/routes.ts                   |   6 +-
 .../dashboard/src/routes/register-auth-routes.ts   |  10 +-
 .../dashboard/src/routes/register-mesh-routes.ts   |   4 +-
 .../register-settings-sync-inbound-routes.ts       |   4 +-
 .../src/routes/register-settings-sync-routes.ts    |   4 +-
 .../src/__tests__/auth-storage-concurrency.test.ts |  84 ++++++++++---
 packages/engine/src/__tests__/auth-storage.test.ts |  48 ++++----
 packages/engine/src/auth-storage.ts                | 137 +++++++++++++--------
 packages/engine/src/provider-auth.ts               |  56 ++++-----
 13 files changed, 284 insertions(+), 173 deletions(-)

Fusion-Task-Id: FN-8205

Fusion-Task-Lineage: b932b9ce-9aee-4f0a-9155-63b026c6bde4

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-17 09:47:40 -07:00