Remove Task tool from all crates

[Sewer56]

Summary

Removes the Task tool from all three crates (core, rig, serdesai) as it was not wired up and users can implement their own task executors if needed.

This simplifies the codebase by removing:

• Task executor trait and mock implementation from core
• Task tool implementations from both rig and serdesai
• Task context documentation
• All related exports and references

Total reduction: 603 lines of code

Changes

Files Deleted

• llm-coding-tools-core/src/operations/task.rs (198 lines)
• llm-coding-tools-core/src/context/task.txt (53 lines)
• llm-coding-tools-rig/src/task.rs (129 lines)
• llm-coding-tools-serdesai/src/task.rs (193 lines)

Files Modified

• Updated all lib.rs files to remove Task tool exports
• Removed Task tool from operations/mod.rs
• Removed TASK constant from tool_names.rs
• Updated context/mod.rs to remove Task context

Testing

• ✅ All 160 tests pass (83 core + 32 rig + 45 serdesai)
• ✅ All doc tests pass
• ✅ Both rig-basic and serdesai-basic examples compile and run successfully

Rationale

The Task tool required implementing a TaskExecutor trait to spawn sub-agents, but no concrete implementation existed beyond the mock. Users who need this functionality can implement their own executors tailored to their specific agent architecture.

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📥 Commits

Reviewing files that changed from the base of the PR and between 81636ce and 0e98f64.

📒 Files selected for processing (10)

• src/llm-coding-tools-core/src/context/mod.rs
• src/llm-coding-tools-core/src/context/task.txt
• src/llm-coding-tools-core/src/lib.rs
• src/llm-coding-tools-core/src/operations/mod.rs
• src/llm-coding-tools-core/src/operations/task.rs
• src/llm-coding-tools-core/src/tool_names.rs
• src/llm-coding-tools-rig/src/lib.rs
• src/llm-coding-tools-rig/src/task.rs
• src/llm-coding-tools-serdesai/src/lib.rs
• src/llm-coding-tools-serdesai/src/task.rs

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove-task-tool

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.26%. Comparing base (1202fdd) to head (0e98f64).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   59.34%   59.26%   -0.09%     
==========================================
  Files          49       46       -3     
  Lines        1338     1274      -64     
==========================================
- Hits          794      755      -39     
+ Misses        544      519      -25     

Flag	Coverage Δ
unittests	59.26% <ø> (-0.09%)	⬇️

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