docs: reconcile hib_changes onto flat structure

Bring over comprehensive documentation, CLI tools, and project
scaffolding from the archived v2/ branch onto the rebuilt flat
main. All v2/ path references updated to match flat layout.

- docs/: architecture, decisions, phases, progress, findings, etc.
- docker/tempo: telemetry stack (Grafana + Tempo)
- CLAUDE.md, .claude/CLAUDE.md: comprehensive project guides
- CHANGELOG.md, TODO.md, README.md: project meta
- consult, ctx: CLI tools
- .gitignore: merged entries from both branches

docker/tempo/grafana-datasources.yaml

@@ -0,0 +1,11 @@
+apiVersion: 1
+
+datasources:
+  - name: Tempo
+    type: tempo
+    access: proxy
+    url: http://tempo:3200
+    isDefault: true
+    jsonData:
+      tracesToLogsV2:
+        datasourceUid: ''