docs(bf-58sdn): add verification note

notes/bf-58sdn.md

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+# Verification Note: bf-58sdn
+
+## Task
+Extend .gitignore to prevent debris tracking
+
+## Work Completed
+
+### 1. Analysis
+- Examined current .gitignore to understand existing debris prevention
+- Checked for tracked debris files using `git ls-files | grep -E '\.(rlib|bak|ppm|txt)$|^(debug_|test_|gen_)'`
+- Identified patterns for backup files and temporary fixture generators
+
+### 2. .gitignore Extension
+Updated `.gitignore` with comprehensive, well-organized rules:
+
+#### Compiled binaries and build artifacts
+- `*.rlib` - Compiled libraries
+- `debug_*, test_*, gen_fixtures, gen_ocr_fixtures` - Binaries in repo root
+- `tests/fixtures/gen_*` - Binaries in tests/fixtures/
+- `tests/*/gen_*.py`, `tests/*/gen_*.rs` - Fixture generators in subdirectories
+- `gen_*.rs` (excluding xtask/src/bin/gen_*.rs) - Generated fixture source files
+
+#### Scratch and temporary output files
+- `*.ppm, mod, out.pdf` - Scratch outputs in repo root
+- `scratch/*.txt, scratch/*.pdf, scratch/*.bin` - Scratch directory patterns
+
+#### Backup and editor temporary files
+- `*.bak, *.bak*, *.bak.*` - Backup files with any extension
+- `*~, *.swp, *.swo, *.tmp, .*.*` - Editor temp files
+
+### 3. Verification
+✅ Build verification passed: `cargo check --quiet` completed successfully
+✅ Commit created: `1631cedc` with message `ci(bf-58sdn): extend .gitignore to prevent debris tracking`
+✅ Pushed to origin/main successfully
+✅ Rules are specific enough to avoid ignoring legitimate source files (e.g., xtask generators are excluded)
+
+## Acceptance Criteria Status
+- ✅ .gitignore contains rules preventing re-tracking of all debris types identified in audit
+- ✅ Rules are specific enough not to ignore legitimate source files
+- ✅ .gitignore is committed with appropriate message
+- ✅ Build still works after .gitignore update
+
+## Files Modified
+- `.gitignore` - Extended with comprehensive debris prevention rules
+- `.needle-predispatch-sha` - Updated automatically
+
+## Commit
+```
+commit 1631cedc
+ci(bf-58sdn): extend .gitignore to prevent debris tracking
+
+Added comprehensive, well-organized rules to prevent tracking of:
+- Compiled binaries and build artifacts (*.rlib, debug_*, test_*, gen_*)
+- Scratch and temporary output files (*.ppm, mod, out.pdf, scratch/)
+- Backup and editor temporary files (*.bak*, *.bak.*, *~, *.swp, *.tmp)
+- Generated fixture source files (gen_*.rs in tests/, excluding xtask/)
+
+Rules are categorized by type for maintainability and specificity to avoid
+ignoring legitimate source files.
+```