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/tempo.yaml

@@ -0,0 +1,19 @@
+server:
+  http_listen_port: 3200
+
+distributor:
+  receivers:
+    otlp:
+      protocols:
+        grpc:
+          endpoint: 0.0.0.0:4317
+        http:
+          endpoint: 0.0.0.0:4318
+
+storage:
+  trace:
+    backend: local
+    local:
+      path: /var/tempo/traces
+    wal:
+      path: /var/tempo/wal