refactor: move optimizer and SubagentInvocation to pytest-aitest; consolidate subagent tool factories

[sbroenne]

Summary

Removes Copilot-specific copies of provider-agnostic functionality now that it lives in \pytest-aitest\ (see sbroenne/pytest-aitest#68).

Changes

Removed: \copilot/optimizer.py\

\InstructionSuggestion\ and \optimize_instruction()\ are deleted from this repo. Import from \pytest_aitest\ directly. Both are still re-exported from \pytest_codingagents\ for convenience.

\\python

canonical

from pytest_aitest import InstructionSuggestion, optimize_instruction

still works

from pytest_codingagents import InstructionSuggestion, optimize_instruction
\\

\SubagentInvocation\ moved to \pytest-aitest\

Removed from
esult.py's _all_. Import from \pytest_aitest:

\\python
from pytest_aitest import SubagentInvocation
\\

\personas.py\ — consolidated tool factories

_make_runsubagent_tool\ and _make_task_tool\ were ~90% identical. Extracted into a single _make_subagent_dispatch_tool(tool_name, ...)\ factory.

Docs

• \how-to/optimize.md\ — autodoc references updated to \pytest_aitest.execution.optimizer.*\
• 
  eference/api.md\ — same
• 
  eference/result.md\ — \SubagentInvocation\ section updated with correct import path

Dependency order

⚠️ Merge sbroenne/pytest-aitest#68 first — this PR requires \pytest-aitest>=0.5.7.

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

pyproject.toml

Package	Version	License	Issue Type
pytest-aitest	>= 0.5.7	Null	Unknown License

OpenSSF Scorecard

Package	Version	Score	Details
pip/pytest-aitest	>= 0.5.7	Unknown	Unknown

Scanned Files

• pyproject.toml