fix: Resolve rustdoc warnings and remove unsafe unwraps

[2witstudios]

Summary

• Wrap Vec<u8> and Vec<String> in backticks in doc comments to fix 2 rustdoc warnings (interpreted as unclosed HTML tags)
• Replace .unwrap() on path.file_name() with safe alternatives (let-else in scan_dir, ? operator in find_in_dir)

Test plan

• cargo test --workspace — all 93 tests pass
• cargo doc --workspace --no-deps — zero warnings
• cargo clippy --all-targets — clean

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dd067786-d864-43c0-94af-cd366916897f

📥 Commits

Reviewing files that changed from the base of the PR and between 55aa882 and 6ca1106.

📒 Files selected for processing (3)

• crates/pu-cli/src/commands/agent_def.rs
• crates/pu-core/src/protocol.rs
• crates/pu-core/src/template.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pu/improve-3

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