Add PR Copilot Review workflow and normalize review result script

[jacwu]

• Create a new GitHub Actions workflow for PR Copilot Review.
• Implement steps to compute diffs, prepare fallback reviews, and run the Copilot CLI for code reviews.
• Update the normalization script to read from the new raw review output file instead of the previous codex review file.

[github-actions]

File	Concern	Recommendation	Severity
.github/workflows/pr-codex-review.yml	Extra blank line at L7	Remove the unnecessary blank line after the on: section for consistency	minor
.github/workflows/pr-codex-review.yml	Trailing whitespace at L105	Remove trailing whitespace after the if condition	minor
.github/workflows/pr-codex-review.yml	Environment variable moved to job level but still referenced in steps	The AZURE_OPENAI_BASE_URL environment variable was removed from individual steps but is still used in the Codex CLI installation step	major
.github/workflows/pr-copilot-review.yml	Extra blank line at L6	Remove the unnecessary blank line after the on: section for consistency	minor
.github/workflows/pr-copilot-review.yml	Trailing whitespace at L94	Remove trailing whitespace after the if condition	minor
.github/workflows/pr-copilot-review.yml	Missing error handling for Copilot CLI installation	No validation that the Copilot CLI installation was successful before attempting to use it	major
.github/workflows/pr-copilot-review.yml	Inconsistent indentation for GITHUB_TOKEN environment variable at L57	Use consistent 2-space indentation instead of 4 spaces	minor
scripts/normalize_review_result.py	Hardcoded filename references updated but error message could be more generic	Consider using a more generic error message that doesn't reference specific filenames	info

Reviewed by GitHub Copilot CLI

[github-actions]

File	Concern	Recommendation	Severity
.github/workflows/pr-copilot-review.yml:L84	The new Copilot review step pipes the CLI through tee without set -o pipefail, so the step will report success even if copilot exits non-zero, silently skipping the review.	Either enable set -o pipefail before running the pipeline or capture ${PIPESTATUS[0]} after the command so the step fails when copilot does.	major

Reviewed by Codex

[Copilot]

Pull Request Overview

This PR adds a new GitHub Actions workflow for Copilot-based PR reviews and standardizes output handling between the existing Codex and new Copilot workflows.

• Add new GitHub Actions workflow for PR Copilot Review that parallels the existing Codex review functionality
• Normalize file naming conventions by using raw_review.md as the standard intermediate output file across both workflows
• Update the normalization script to read from the standardized filename

Reviewed Changes

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

File	Description
.github/workflows/pr-copilot-review.yml	New workflow implementing Copilot CLI-based code reviews with similar structure to existing Codex workflow
.github/workflows/pr-codex-review.yml	Updated to use standardized raw_review.md filename and improved environment variable handling
scripts/normalize_review_result.py	Updated to read from raw_review.md instead of codex_review.md for consistency

[Copilot]

Inconsistent indentation - the environment variable should be indented with 2 spaces to align with the step structure, not 4 spaces.

[Copilot]

Inconsistent indentation - the environment variable should be indented with 2 spaces to align with the step structure, not 4 spaces.

Suggested change

	GITHUB_TOKEN: ${{ secrets.COPILOT_CLI_PAT }}
	GITHUB_TOKEN: ${{ secrets.COPILOT_CLI_PAT }}