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

[Copilot]

The .github/agents/branch-reviewer.agent.md custom Copilot CLI agent was missing from the Workflows table at the bottom of README.md, despite documentation conventions requiring all workflows, CI/CD pipelines, and agents to be listed there.

Changes

• README.md: Updated the Workflows table header from Workflow to Workflow / Agent and added a row for the Branch Reviewer agent:

| [Branch Reviewer](.github/agents/branch-reviewer.agent.md) | On demand (Copilot CLI) | Reviews branch changes, summarizes commits, and detects breaking changes vs. `main` |

Original prompt

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This section details on the original issue you should resolve

<issue_title>[docs] Documentation update needed for push to main by @jkordick</issue_title>
<issue_description>## Summary

Commit 64dccf89 added a new custom agent (.github/agents/branch-reviewer.agent.md) directly to main. The follow-up PR #44 (commit 429cf80) added a Workflows section to README.md, but the branch-reviewer agent is not listed in that section.

What Changed

• Added: .github/agents/branch-reviewer.agent.md — a custom Copilot CLI agent for reviewing branch changes, summarizing commits, detecting breaking changes vs. main, and assessing PR readiness.

Documentation Gap

According to the documentation instructions:

Workflows, CI/CD pipelines and agents should be mentioned in a short list on the bottom of the README.md.

The current README.md Workflows table (bottom of the file) lists the three CI/CD workflows but omits the branch-reviewer agent entirely.

Suggested Fix

Add a row for the branch-reviewer agent to the Workflows table in README.md:

| [Branch Reviewer](.github/agents/branch-reviewer.agent.md) | On demand (Copilot CLI) | Reviews branch changes, summarizes commits, and detects breaking changes vs. `main` |

The updated table would look like:

Workflow / Agent	Trigger	Description
Documentation Updater	Push / PR to main	Checks documentation completeness and reports gaps via issues or PR comments
Documentation Audit	Weekly schedule	Performs a full audit of project documentation for accuracy and completeness
Test Enhancer	On demand	Agentic workflow that analyzes the codebase and proposes improvements to test coverage
Branch Reviewer	On demand (Copilot CLI)	Reviews branch changes, summarizes commits, and detects breaking changes vs. main

Generated by Documentation Updater

Comments on the Issue (you are @copilot in this section)

• Fixes [docs] Documentation update needed for push to main by @jkordick #46

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