pull_request_template.md

• cargo test passes on your platform
• cargo clippy --all-targets --all-features -- -D warnings is clean
• cargo fmt has been run
• New tests cover the change, including error paths
• Fuzz corpus updated if a parser changed
• A regression test exists if this fixes a bug, with the triggering input in the corpus
• CHANGELOG.md updated under [Unreleased]
• An ADR added for any new dependency, unsafe block, or architectural change
• docs/THREAT_MODEL.md and docs/KNOWN_LIMITATIONS.md updated if a format handler changed
• INSTRUCTIONS.md updated if any command changed
• No test file carries real personal data