Add workflow for daily documentation updates (#132)

* Initial plan

* Add daily docs-sync agentic workflow

Creates a GitHub Agentic Workflow that runs daily on weekdays
to identify documentation files that have drifted from recent
code changes and opens a pull request with the necessary updates.

Uses Copilot engine with GitHub MCP tools, bash, and edit tools.
Read-only permissions with safe-outputs for PR creation.

Co-authored-by: ewega <26189114+ewega@users.noreply.github.com>

* Restrict docs-sync workflow tools and paths for safety

- Restrict bash to specific safe commands (git, cat, grep, find, ls,
  head, tail, wc) instead of bash: true — eliminates --allow-all-tools
- Add engine.args --allow-paths to restrict file edits to README.md
  and docs/** only
- Remove AGENTS.md from editable targets (compiler protects it)
- Update prompt to clarify AGENTS.md is read-only

Co-authored-by: ewega <26189114+ewega@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ewega <26189114+ewega@users.noreply.github.com>

Author: Copilot