[Douglasymlai]

Pull Request

Related Issue

N/A — maintainer-directed repair; no linked issue required for this PR.

Description

Problem

A model-capability refusal left a pending task without an attempt. Reloading lost its error and could leave queued work waiting.

Change

Persist a failed task event and refusal reason for permanent initial admission refusals. Protect admitted and foreign tasks, reject the matching queued request atomically, and keep a request without execution evidence out of the planning display. Transient Session-busy conflicts remain retryable rather than becoming failed Runs. Updated against current main.

Testing Evidence (REQUIRED)

• 74 backend/controller tests passed, 1 existing skip, including permanent refusal, retryable 409, replay reason, subsequent admission, and ownership protection.
• 92 frontend tests passed for Project state and pending planning; type checking, focused ESLint/Prettier, repository Ruff, and git diff --check passed.
• Existing primitives and semantic styling retained; no new UI components, tokens, or exceptions.
• No packaged-app refusal/reload scenario was run. Remote CI is triggered by the updated head.
• Follow-up fix: refusing a queued follow-up now closes its queue row as cancelled (the previous value failed a database check and left the task pending). New regression test queues a follow-up before the refusal; 11 related backend tests pass.

Automated checks only; manual app testing is pending.

• I have included human-verified testing evidence in this PR.
• This PR includes frontend/UI changes, and I attached screenshot(s) or screen recording(s).
• No frontend/UI changes in this PR.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Contribution Guidelines Acknowledgement

• I have read and agree to the Eigent Contribution Guideline