Add a Manual Mode example for PR review evidence

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Goal

Add one small Manual Mode example focused on PR review evidence.

Why this helps

Manual Mode is the easiest path for people to understand VALP before installing a runtime. A PR-review-shaped fixture would make the adoption path clearer.

Scope

• Keep private project data out of the example.
• Include the expected evidence refs.
• Make sure bin/valp audit <example> passes or document the intended warning.

Verification

• Run scripts/verify-examples.sh if the fixture is included in the main smoke check.
• At minimum, run bin/valp audit <new-example-path>.