Debug: Log missing line numbers in ast-grep output

[brendanjryan]

Problem

PR x shows all lint warnings with line number 1:

/home/runner/work/purl/purl/lib/src/keystore/encrypt.rs:1 [warning] no-unwrap-in-lib: ...

This is happening because issue.range?.start?.line is undefined in the ast-grep JSON output in CI, causing all line numbers to default to 1 (see shared.ts:94).

Solution

This PR adds debug logging to understand what the actual JSON structure looks like when range data is missing.

Next Steps

Once we see the logs, we can:

1. Fix the JSON parsing to handle the actual format
2. Or investigate why ast-grep isn't outputting range data in CI

To Test

Use this branch temporarily in a workflow to see the putout

uses: tempoxyz/lints@fix-line-numbers-debug