fix: add Python script routing to extension commands

[AreebaxIrfan]

Description

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

AI Disclosure

• I did not use AI assistance for this contribution
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AI disclosure: N/A

[mnriem]

Please make sure you also bump the catalog versions for each of these bundled extensions for this fix

[Copilot]

Copilot review overview

🟡 Changes recommended

Git feature and auto-commit hooks omit required runtime arguments, and the rendering test does not exercise actual placeholder routing.

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Review effort: Balanced
Findings: 2 · 1

Open (3)

• Auto-commit hooks omit the required event name argument · New
• before_specify hook omits the required feature description · New
• Routing test misses required {SCRIPT} placeholder · New

What changed in this PR

Adds Python script metadata and routing tests for bundled extension commands.

Changes:

• Adds sh, ps, and py script declarations to four commands.
• Documents Python invocation paths.
• Adds routing and compatibility tests.

File	Description
extensions/​git/​commands/​speckit.git.initialize.md	Declares Python initialization script.
extensions/​git/​commands/​speckit.git.feature.md	Declares and documents Python branch script.
extensions/​git/​commands/​speckit.git.commit.md	Declares and documents Python auto-commit script.
extensions/​agent-context/​commands/​speckit.agent-context.update.md	Declares Python context updater.
tests/​extensions/​test_extension_command_py_scripts.py	Tests extension script selection and paths.

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[mnriem]

Could you describe a concrete failure this fixes for a project initialized with --script py, including the expected command output? In command rendering, scripts: supplies the value for {SCRIPT}, but none of these four command bodies contains {SCRIPT}. The added Python paths are prose, so the new tests do not demonstrate that the selected script appears in an installed command. Please add a regression test that fails before the change and verifies the rendered invocation afterward.

The frontmatter also enables hook dispatch. speckit.git.feature requires a feature description and speckit.git.commit requires an event name, but the dispatcher does not pass either argument. Please cover successful hook execution with those inputs before enabling these routes, and bump the bundled extension and catalog versions so installed users receive the fix.

Drafted on behalf of @mnriem by GitHub Copilot (model: GPT-6 Sol, autonomous); comment fully AI-drafted.