feat: Add --keep-memory flag to preserve constitution when switching AI agents

[nShieldSolo]

Summary

Added --keep-memory flag to specify init command that preserves memory/constitution.md when switching between AI agents on an existing project.

Problem

When users switch AI assistants (e.g., from Claude to Gemini) using specify init . --ai gemini, the existing memory/constitution.md file (which may contain customized project-specific constitution) gets overwritten with the template version.

Solution

Added --keep-memory flag that skips overwriting memory/constitution.md if it already exists:

specify init . --ai gemini --keep-memory

[Copilot]

Pull request overview

This PR adds a --keep-memory flag to the specify init command to address the known issue where switching AI agents overwrites customized memory/constitution.md files. The flag allows users to preserve their existing constitution when re-initializing a project with a different AI assistant.

Changes:

• Added --keep-memory flag parameter to the init command
• Modified download_and_extract_template function to accept a preserve_constitution parameter
• Implemented logic to skip overwriting constitution.md when the flag is active and the file exists
• Updated version from 0.0.22 to 0.0.23 and documented the change in CHANGELOG.md

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/specify_cli/init.py	Added --keep-memory flag to init command, added preserve_constitution parameter to download_and_extract_template, and implemented constitution preservation logic
pyproject.toml	Bumped version from 0.0.22 to 0.0.23
CHANGELOG.md	Added changelog entry for version 0.0.23 documenting the new --keep-memory flag

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[Copilot]

The constitution preservation logic is incorrect. When iterating through the extracted template, item represents the .specify directory (not memory), and rel_path would be memory/constitution.md (not just constitution.md). The condition item.name == "memory" will never be true, so the --keep-memory flag won't work. The correct check should be item.name == ".specify" and rel_path == Path("memory/constitution.md") or rel_path == Path("memory") / "constitution.md".

Suggested change

	# Skip constitution.md if preserve_constitution is True and file exists
	if preserve_constitution and dest_file.exists() and rel_path == Path("constitution.md") and item.name == "memory":
	# Skip memory/constitution.md if preserve_constitution is True and file exists
	if preserve_constitution and dest_file.exists() and rel_path == Path("memory") / "constitution.md":