feat: add error self-recovery instructions to taskMaestro worker prompt template

[JeremyDev87]

Purpose

Workers that encounter errors (git add failure, test failure, tool call error) often stop and wait for conductor intervention instead of self-recovering. The worker prompt template should include explicit self-recovery instructions.

Changes

• .claude/skills/taskmaestro/SKILL.md — Enhance worker prompt template in assign subcommand

Expected Behavior

Add to worker prompt template:

[ERROR RECOVERY PROTOCOL]
If any command fails:
1. DO NOT STOP. Read the error message carefully.
2. Diagnose: run git status, check file paths, verify dependencies
3. Fix: apply the minimal fix to resolve the error
4. Retry: re-run the failed command
5. If 3 retries fail: write RESULT.json with status "failure" and error details
6. Reference systematic-debugging skill for complex errors

NEVER go idle after an error without either:
  a) Recovering and continuing, OR
  b) Writing RESULT.json with failure status

Acceptance Criteria

• Error recovery protocol added to worker prompt template
• Covers: git errors, test failures, tool call errors, dependency issues
• Maximum 3 retry attempts before failure RESULT.json
• References systematic-debugging skill
• Can be merged independently

References

• Incident: 2026-03-22 Wave 3 pane 4 (feat(mcp): add auto-dispatch strength to parse_mode specialist recommendations #808) — git add path error, stopped
• Incident: 2026-03-22 Wave 3 pane 3 (feat(mcp): add teams execution strategy to dispatch_agents #807) — parallel tool call error, stopped
• Parent: Improve taskMaestro parallel execution reliability (retrospective action items) #866