#22786: fix: guard against undefined file.path in system-prompt-report

## Summary - Adds a null/undefined guard for `file.path` in `buildInjectedWorkspaceFiles()` to prevent `TypeError: Cannot read properties of undefined (reading 'replace')` when workspace bootstrap files have missing paths Fixes #22693 ## Local Validation - [x] Code review: guard prevents crash when `file.path` is `undefined` - [x] Existing tests pass (the guard simply skips entries with no path) ## Scope XS — 3-line guard addition in one file ## AI Assistance Used Claude Code for issue identification and fix implementation. ## Author @miloudbelarebia 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> <!-- greptile_comment --> <h3>Greptile Summary</h3> Adds a defensive guard to prevent crashes when `file.path` is undefined in workspace bootstrap files. The fix prevents `TypeError: Cannot read properties of undefined (reading 'replace')` by skipping files with missing paths when building the injected basename map. <h3>Confidence Score: 5/5</h3> - Safe to merge - defensive guard prevents crash without changing behavior - The fix is minimal, defensive, and correctly prevents the crash by skipping problematic entries. The guard only affects the basename map building, and files with undefined paths will still be processed by the main map lookup on line 58. The logic is sound and follows defensive programming practices. - No files require special attention _{Last reviewed commit: f92821b} <!-- greptile_other_comments_section --> <!-- /greptile_comment -->