chore: fix .gitignore inline comments + add untracked code files

Inline # comments in gitignore are not supported — they were silently
breaking three patterns (data/checkpoints/, data/adapter-migration-state.json,
.claude/agents/.generated/). Moved comments to their own lines and added
missing entries for runtime dirs (data/audit/, data/logs/, etc.) and
temp files (.interaction_tmp.json, .design-build/, .taskmaster bak files).

Also tracks previously untracked legitimate files: scripts, tests, docs,
skills references, .env.example, taskmaster templates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -6,7 +6,8 @@ data/backups/
 data/precedent-library/
 data/.auto-sync.log
 data/*.db
-data/checkpoints/        # X16 durable-pipeline SQLite checkpoints (runtime artifact)
+# X16 durable-pipeline SQLite checkpoints (runtime artifact)
+data/checkpoints/
 *.bak-pre-*
 mcp-server/.venv/
 __pycache__/
@@ -18,6 +19,30 @@ kiryat-yearim/
 continuation-prompt.md
 node_modules/
 data/eval/eval-report-*
-data/adapter-migration-state.json   # revert snapshot for migrate_agent_adapter.py (runtime state)
-.claude/agents/.generated/          # frontmatter-stripped instruction copies for content_arg adapters (generated)
+# revert snapshot for migrate_agent_adapter.py (runtime state)
+data/adapter-migration-state.json
+# frontmatter-stripped instruction copies for content_arg adapters (generated)
+.claude/agents/.generated/
 .claude/worktrees/
+
+# TaskMaster backups (runtime)
+.taskmaster/tasks/tasks.json.bak.*
+
+# Build artifacts
+.design-build/
+
+# Temp files
+.interaction_tmp.json
+
+# Runtime eval/ab-test data
+data/ab_halacha_*.json
+data/ab_run_*.log
+data/x11_treatment_run_*.log
+
+# Runtime data directories
+data/audit/
+data/bulletins/
+data/digests/
+data/internal-decisions/
+data/learning/
+data/logs/