fix(ripgrep): handle malformed JSON lines gracefully in search results

[edlsh]

Problem

Ripgrep.search crashes with SyntaxError: JSON Parse error when ripgrep outputs malformed JSON lines. This can happen due to:

• Corrupted output
• Binary file detection messages
• Interrupted streams

Currently JSON.parse(line) is called without error handling, causing the entire search to fail on a single bad line.

Solution

Extract JSON parsing into a parseJsonLines helper with try/catch that:

• Skips malformed JSON lines instead of crashing
• Logs warnings with context (first 200 chars) for debugging
• Uses Result.safeParse for schema validation failures
• Returns only successfully parsed matches

Also skip Ripgrep.search tests when rg binary is unavailable to prevent network downloads during test runs.

Testing

bun test test/file/ripgrep.test.ts

All 8 tests pass:

• 3 integration tests for Ripgrep.search (skipped if rg unavailable)
• 5 unit tests for Ripgrep.parseJsonLines (always run)