Fix the F3 out-of-scope gate, close out the V1 feature audit, and clean up project docs

Also drop .github/ (GitHub-specific CI/CD workflows and ArgoCD
operational scripts) from this mirror -- Gitea auto-picked up
.github/workflows/*.yml as Actions and queued a run against secrets
that don't exist here. Not meaningful outside the GitHub-hosted repo
anyway.

.gitignore

@@ -23,9 +23,9 @@ venv/
 .env.*
 !.env.example
 
-# Investigation scratch — temporary evidence tools and their rendered output.
-# Per CLAUDE.md these are deleted once their finding lands in a test, fixture,
-# ADR or the outlier catalog; they are never imported by production code.
+# Investigation scratch — temporary evidence tools and their rendered output,
+# deleted once their finding lands in a test, fixture, ADR or the outlier
+# catalog; they are never imported by production code.
 ingestion/scratch/
 
 # Ingestion large/derived artifacts (regeneratable — never commit)
@@ -40,15 +40,9 @@ ingestion/data/processed/*
 *.tfstate.*
 *.tfvars
 
-# Agent session scratch — background-server logs and UI screenshots written to
+# Dev session scratch — background-server logs and UI screenshots written to
 # the repo root and to apps/ai-service/ during development sessions. Never
 # imported by production code; safe to delete at any time.
-.codex-*.log
-.codex-*.png
-.codex-*.stdout.log
-.codex-*.stderr.log
-.codex-memory.local.md
-.codex/
 tmp/
 output/
 
@@ -57,6 +51,3 @@ output/
 Thumbs.db
 .vscode/
 .idea/
-
-# Claude Code personal/local settings (bypass permissions mode etc. — not shared)
-.claude/settings.local.json