#20465: fix: remove WORKFLOW_AUTO.md from default post-compaction audit reads

## Summary Removes `WORKFLOW_AUTO.md` from `DEFAULT_REQUIRED_READS` in the post-compaction audit. ## Problem `WORKFLOW_AUTO.md` was hardcoded in the default required reads list but is never auto-generated by `openclaw setup`, `openclaw onboard`, or any bootstrap process. It's also undocumented. This caused a spurious warning on every compaction for most users: > ⚠️ Post-Compaction Audit: The following required startup files were not read after context reset: > - WORKFLOW_AUTO.md The agent then either gets a read error or wastes a tool call trying to read a missing file. ## Fix Remove `WORKFLOW_AUTO.md` from the default list. The `requiredReads` parameter still accepts custom entries, so users who create this file can pass it explicitly. ## Testing - Updated existing tests to use explicit required reads where `WORKFLOW_AUTO.md` behavior was being tested - Added new test verifying defaults no longer include `WORKFLOW_AUTO.md` - All 16 tests pass, plus 10 post-compaction-context tests unaffected Fixes #20444 [AI-assisted] — lightly tested (unit tests pass, no e2e) <!-- greptile_comment --> <h3>Greptile Summary</h3> Removes `WORKFLOW_AUTO.md` from the default required reads list in the post-compaction audit to eliminate spurious warnings for users who don't have this file. The file was never auto-generated by setup/onboard commands and is undocumented, causing unnecessary warnings on every compaction. Users who create this file can still pass it explicitly via the `requiredReads` parameter. - Updated `DEFAULT_REQUIRED_READS` constant to only include the memory file pattern - Modified all existing tests to use explicit required reads where `WORKFLOW_AUTO.md` behavior was tested - Added new test case verifying defaults no longer include `WORKFLOW_AUTO.md` - Added clear comments explaining the rationale (references #20444) <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk - The change is well-isolated, thoroughly tested, and solves a real user-facing issue. The removal of `WORKFLOW_AUTO.md` from defaults is the correct fix since the file is never auto-generated. Tests have been properly updated to explicitly pass the file when testing its behavior, and a new test validates the fix. The change is backwards-compatible since users can still pass `WORKFLOW_AUTO.md` via the `requiredReads` parameter. - No files require special attention _{Last reviewed commit: e44e3ec} <!-- greptile_other_comments_section --> <!-- /greptile_comment -->