docs: add branch-reviewer agent to Workflows table in README (#47)

* docs: add branch-reviewer agent to Workflows table in README

Co-authored-by: jkordick <52427852+jkordick@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jkordick <52427852+jkordick@users.noreply.github.com>

Author: Copilot

README.md

@@ -1031,11 +1031,12 @@ See [Parallel Jobs Formula](#parallel-jobs-formula) for chunking configuration d
 
 ## ⚙️ Workflows
 
-| Workflow | Trigger | Description |
+| Workflow / Agent | Trigger | Description |
 |---|---|---|
 | [Documentation Updater](.github/workflows/documentation-updater.lock.yml) | Push / PR to `main` | Checks documentation completeness and reports gaps via issues or PR comments |
 | [Documentation Audit](.github/workflows/documentation-audit.lock.yml) | Weekly schedule | Performs a full audit of project documentation for accuracy and completeness |
 | [Test Enhancer](.github/workflows/test-enhancer.lock.yml) | On demand | Agentic workflow that analyzes the codebase and proposes improvements to test coverage |
+| [Branch Reviewer](.github/agents/branch-reviewer.agent.md) | On demand (Copilot CLI) | Reviews branch changes, summarizes commits, and detects breaking changes vs. `main` |
 
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