Python cache refactor & docs update

[opencode-agent]

I have improved the copilot-setup-steps.yml workflow by replacing the manual actions/cache step with the built-in caching feature of actions/setup-python. This simplifies the workflow while maintaining efficient dependency management. I also updated the corresponding AGENTS.md file to reflect these changes and verified the modifications using pre-commit (including actionlint and yamllint).

Key Changes:

• Workflow Update: Configured actions/setup-python to use cache: pip with the dependency path set to .devcontainer/requirements.txt.
• Cleanup: Removed the manual Restore Python user site cache step and the conditional logic for dependency installation, as pip install will now leverage the cached downloads automatically.
• Documentation: Updated .github/workflows/AGENTS.md to reflect that Python dependencies are now cached via the native setup-python mechanism.
• Validation: Verified the changes passed all linting and validation gates via pre-commit.

Triggered by workflow_dispatch

opencode session  |  github run

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refactors the Copilot setup workflow to use the native pip cache in actions/setup-python instead of a separate actions/cache step, simplifying dependency installation logic and updating the AGENTS documentation to match.

File-Level Changes

Change	Details	Files
Use built-in pip caching from actions/setup-python instead of a separate actions/cache step for Python dependencies.	Configured actions/setup-python to enable pip caching with cache: pip. Pointed cache-dependency-path to .devcontainer/requirements.txt so cache keys are derived from dependency definitions. Removed the standalone Restore Python user site caching step that used actions/cache.	.github/workflows/copilot-setup-steps.yml
Simplify dependency installation logic now that caching is handled by setup-python.	Removed conditional execution of the pip install step based on the previous cache hit output. Kept a single unconditional python -m pip install --user -r .devcontainer/requirements.txt step that now leverages the setup-python cache implicitly. Left PATH configuration for ~/.local/bin unchanged to preserve behavior.	.github/workflows/copilot-setup-steps.yml
Align workflow documentation with the new Python caching mechanism.	Updated the caching description to state that Python dependencies are cached via actions/setup-python (pip). Clarified that the cache is still keyed against .devcontainer/requirements.txt while removing reference to the ~/.local user site cache.	.github/workflows/AGENTS.md

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[sourcery-ai]

Hey - I've left some high level feedback:

• The change from caching ~/.local to using cache: pip alters behavior from restoring installed site-packages to only restoring the pip download cache; if startup time was important, consider noting or measuring the impact of reinstalling dependencies on every run.
• Given that pip install --user is now always executed, confirm that this is intentional for reproducibility; if not, you may want to reintroduce a lightweight guard (e.g., checking a marker file) to skip redundant installs while still leveraging the pip cache.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The change from caching `~/.local` to using `cache: pip` alters behavior from restoring installed site-packages to only restoring the pip download cache; if startup time was important, consider noting or measuring the impact of reinstalling dependencies on every run.
- Given that `pip install --user` is now always executed, confirm that this is intentional for reproducibility; if not, you may want to reintroduce a lightweight guard (e.g., checking a marker file) to skip redundant installs while still leveraging the pip cache.

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