Clean up ad-hoc root audit/report files (#82)

Remove two regeneratable pipeline outputs from version control and
gitignore them so future runs don't re-track them:

- `evidence_curation_report.txt` (35 KB, Feb-stale): output of
  `scripts/curate_evidence_with_pdfs.py`; consumed downstream by
  `apply_suggested_snippets.py`, `apply_suggested_fixes.py`, and
  `batch_snippet_fixer.py` within a single workflow run, so its
  content does not need to be versioned.
- `network_integrity_audit.txt` (113 B stub, May-stale): default
  output path of the `audit-network-report` justfile recipe. Was
  essentially empty (header only) at commit time.

Documentation references (docs/CURATION_PROGRESS_REPORT.md,
docs/AUTOMATION_TOOLS.md, notes/NETWORK_CURATION_REPORT.md) point at
the filenames, not the content, so the references remain valid: the
scripts regenerate the files when invoked.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: realmarcin

.gitignore

@@ -89,6 +89,13 @@ config.local.mk
 # Logs
 *.log
 
+# Curation / audit pipeline outputs — these are regeneratable artifacts
+# produced by scripts/curate_evidence_with_pdfs.py and the
+# `audit-network-report` justfile recipe; downstream scripts read them
+# within a workflow run, but they should not live in version control.
+evidence_curation_report.txt
+network_integrity_audit.txt
+
 # Temporary files
 *.tmp
 .temp/