chore: Archie 2.8.4 integration

.archie/.gitignore

@@ -0,0 +1,32 @@
+# Archie tool internals — vendored tooling + caches, (re)generated by
+# `npx @bitraptors/archie`. These are NOT architecture artifacts: they are the
+# tool's own source and dependencies, copied in so the hooks/viewer can run.
+#
+# They're git-ignored so you don't commit the tool into your repository — which
+# also stops security scanners from flagging Archie's vendored code as if it
+# were yours. Re-running the installer recreates them.
+#
+# The architecture snapshot you MAY want to commit lives alongside these and is
+# deliberately NOT ignored: blueprint.json, rules.json, scan_report.md,
+# findings.json, health.json, c4.json, etc.
+
+_install_pkg/
+viewer/
+node_modules/
+__pycache__/
+*.pyc
+*.tmp
+tmp/
+.cache/
+.test_snapshots/
+
+# Standalone tool scripts are regenerated by the installer too — don't commit
+# them. EXCEPTION: the small hook-runtime set below is committed so the
+# enforcement hooks keep working even without a local Archie install. Their file
+# reads are routed through one validated sink (_common.safe_read_text), so a
+# security scanner has nothing to flag.
+*.py
+!_common.py
+!lint_gate.py
+!align_check.py
+!arch_review.py