fix: add iteration limits to prevent infinite loops (#1349)

[code-yeongyu]

Fixes #1349

Summary

Adds configurable iteration limits to the todo-continuation-enforcer hook to prevent Sisyphus-Junior from getting stuck in infinite loops.

Changes

• Added max_stale_injections config to schema with sensible default
• Implemented injection counting and circuit breaker in todo-continuation-enforcer
• Loop stops after N consecutive injections without todo completion progress
• Added tests for the iteration limit behavior (BDD format)

Testing

• bun test src/hooks/todo-continuation-enforcer.test.ts — PASS
• bun run typecheck — PASS

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Summary by cubic

Add iteration limits and a circuit breaker to the todo-continuation enforcer to prevent infinite loops. Caps total injections and stops on consecutive stale cycles, with a warning toast and reset on user activity.

• Bug Fixes
  • Added todo_continuation config: max_injections (default 8) and max_stale_injections (default 3).
  • Count injections and detect no-progress cycles; stop continuation, cancel countdowns, and show a warning toast.
  • Reset on user messages; wired config into the plugin; added tests for max-injection and stale-progress scenarios.

^{Written for commit bb45b0e. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 7 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.