fix: disable remote deployment and stabilize task cleanup

[4pmtong]

Pull Request

Related Issue

No linked Issue. This bug was found internally while investigating generated web tasks that did not terminate reliably.

Description

This is the release-safe subset of #1906. It addresses the two direct causes found in the reproduced task while deliberately excluding the broader SSE, follow-up, background-trigger, Project eviction, and RunCoordinator lifecycle changes.

• Removes Web Deploy Toolkit from the Workforce Developer Agent and Single Agent assembly because Eigent does not need to upload generated content to the legacy remote deployment service.
• Ignores legacy toolkit configuration that still requests web_deploy.enabled=true.
• Removes deployment claims from the Developer Agent prompt, Workforce coordinator description, and workflow capability lists.
• Keeps web_deploy_toolkit.py and historical rendering support intact for possible future use and compatibility.
• Increases the terminal background-cleanup checkpoint budget from 5 seconds to 30 seconds so a stopped preview server can release its write lease and finish the workspace Git checkpoint before Run finalization.

Testing Evidence (REQUIRED)

Automated validation completed through commit c134cab4f:

• Focused backend tests for Developer Agent assembly, toolkit descriptions, terminal workspace cleanup, and Workforce construction — 20 passed.
• npm run type-check — passed.
• Focused ESLint and Prettier checks — passed.
• Focused Ruff lint and Ruff format checks — passed.
• npm run check:design-tokens — passed.
• git diff --check — passed.

Human UI evidence has not yet been attached. The generated-web-task scenario will be retested against this branch before merge.

• 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

Pending confirmation by the human contributor; this is intentionally not checked on their behalf.

• I have read and agree to the Eigent Contribution Guideline