Instruct agents not to mention on-disk data sources in responses

[Copilot]

This PR stops agents from exposing internal on-disk data source paths in user-facing responses.

What changed

• Updated .github/workflows/gh-aw-fragments/pr-context.md to explicitly instruct agents to never mention file paths or on-disk data sources in responses.
• This fragment is shared by the PR-focused agent workflows (pr-review-addresser, pr-review, mention-in-pr, mention-in-pr-no-sandbox, and mention-in-pr-by-id), so the guidance applies consistently across them.

Why

Agents were replying with implementation details such as references to /tmp/pr-context/... files, which should remain internal.

• Fixes Agents shouldnt mention on-disk data sources #494

Generated by Update PR Body for issue #499

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ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between fdd2b5c and 63ed91d.

📒 Files selected for processing (1)

• .github/workflows/gh-aw-fragments/pr-context.md

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📝 Walkthrough

Walkthrough

A safety note has been added to the PR Context manifest file to instruct against mentioning on-disk or internal file paths in responses. The change updates user-facing guidance without modifying data retrieval or processing logic. This aligns with the objective to prevent agents from referencing internal data sources during interactions.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR adds a safety instruction to pr-context.md preventing agents from mentioning on-disk file paths, directly addressing issue #494's requirement to hide internal implementation details from user-facing responses.
Out of Scope Changes check	✅ Passed	The PR scope is limited to a single safety instruction addition in pr-context.md manifest file, with no extraneous changes beyond the stated objective.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/fix-on-disk-data-mention

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