Add SQLite-backed bidirectional sync tool for PreTeXt book structure/content

[Copilot]

• Review new PR comments and identify actionable requests
• Re-check repository tooling and relevant files for minimal change scope
• Add conflict-path logging in the sync tool when --prefer none detects conflicts
• Run targeted validation for the conflict scenario and existing sync workflow
• Commit the minimal change and reply to the addressed PR comment
• Run code review/security checks and finalize

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[Copilot]

Pull request overview

This PR introduces a SQLite-based bidirectional synchronization tool for managing PreTeXt book content between source files and a database. The tool is designed as a beginner-friendly workflow utility for solo authors and small teams to inspect and edit book content via database queries while maintaining sync with the source .ptx files.

Changes:

• Adds a new Python sync utility with init/pull/push/sync commands and conflict detection/resolution
• Provides comprehensive documentation explaining the database schema, sync strategy, and practical workflows
• Updates .gitignore to exclude Python cache files for the new tooling

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
processing-tools/book-db-sync/book_db_sync.py	Core sync utility implementing bidirectional sync with hash-based conflict detection, path traversal protection, and parameterized SQL queries
processing-tools/book-db-sync/README.md	Documentation covering database schema, sync strategy, usage examples, and practical workflows
.gitignore	Adds Python cache files (pycache/, *.pyc) to gitignore

[Copilot]

When conflicts are detected with prefer="none", only the count is reported without identifying which specific files have conflicts. Consider logging the conflicting file paths to help users identify and resolve conflicts more easily. For example, print a warning message with the href when a conflict is detected.

[geoff-cox]

@copilot apply changes based on this feedback

[Copilot]

Implemented in b65b45e. The sync tool now prints the specific conflicting href whenever sync --prefer none detects a conflict, so you can immediately see which file needs resolution.