feat: add version feature reporting

[PascalThuet]

Summary

Follow-up to #2498 and #2519.

Adds local CLI capability reporting to specify version so users and coding agents can determine whether the installed CLI supports key workflows before trying them.

Changes

• Add specify version --features for human-readable local capability output.
• Add specify version --features --json for machine-readable capability output.
• Reject specify version --json without --features to keep the JSON surface scoped.
• Document the new options in the core command reference.

Notes

This intentionally stays local and offline. It does not check latest releases or inspect project state; those remain separate follow-ups.

Validation

Local:

• uv run pytest tests/test_cli_version.py -v
• git diff --check origin/main

CI:

• Full pytest, ruff, and markdownlint coverage runs via GitHub Actions on the PR.

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

Used AI assistance to inspect CLI command structure, implement the scoped feature-reporting change, add tests/docs, and run local validation. The changes were reviewed before submission.

[Copilot]

Pull request overview

Adds a specify version --features (and --features --json) subcommand mode that reports the installed CLI's local capability flags, so users and coding agents can detect feature support without network calls. Follows up on #2498/#2519.

Changes:

• Add _feature_capabilities() helper and extend version command with --features / --json flags (rejecting --json without --features).
• Add TestVersionCommand covering the text output, JSON output, and the validation error.
• Document the new flags in docs/reference/core.md.

Show a summary per file

File	Description
src/specify_cli/init.py	Adds capability flags helper and new --features/--json options on the version command
tests/test_cli_version.py	Tests for text output, JSON output, and --json without --features rejection
docs/reference/core.md	Documents the new flags and intended audience

Copilot's findings

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• Files reviewed: 3/3 changed files
• Comments generated: 0

[mnriem]

Thank you!