Add monitor-dash render to README; prepare wiki layout

- Move uploaded renders into docs/images/ (tracked).
- Insert the Monitor Dash render at the top of README.md as the
  headline image of the project.
- Rewrite README body to point at the forgejo wiki (six pages now
  live) as the canonical documentation surface, with PLAN.md
  staying as working notes.
- Gitignore docs/wiki/ so the wiki git checkout does not bleed
  into the main repo.

Refs #1

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -175,3 +175,6 @@ cython_debug/
 # Superpowers brainstorm companion working dir
 .superpowers/
 
+
+# Local wiki checkout (separate git repo)
+docs/wiki/

README.md

@@ -1,31 +1,39 @@
 # claude-gauge
 
-Hardware instrument cluster displaying Claude Code session telemetry.
+Hardware instrument cluster displaying Claude Code session telemetry
+in real time.
 
-Three analog needle gauges (5h fuel, tokens/min tach, 7d fuel) plus
-an annunciator row of model-indicator and warning lamps, driven by
-an ESP32 polling a local Python daemon. The daemon reads either
-Claude Code's native OpenTelemetry feed through a Prometheus stack
-(architecture A) or `ccusage` CLI aggregates with a direct JSONL
-tail for the tach (architecture B). Firmware and cluster are
-identical across both.
+![Monitor-mounted cluster with four gauges and annunciator row](docs/images/monitor-dash.png)
 
-Fighter-jet / race-car aesthetic. Physical-first: all the deep
-stats live in Grafana (A) or ccusage's own surfaces (B). The dial
-on the desk is the ambient summary.
+Four analog needle gauges (5h fuel, tokens/min tach, thinking ratio,
+cache hit) plus an annunciator row of model-indicator and warning
+lamps, driven by an ESP32 polling a local Python daemon. The daemon
+reads either Claude Code's native OpenTelemetry feed through a
+Prometheus stack (architecture A) or `ccusage` CLI aggregates with a
+direct JSONL tail for the tach (architecture B). Firmware and
+cluster are identical across both.
 
-See [PLAN.md](PLAN.md) for:
+Fighter-jet / race-car aesthetic. Physical-first: the deep stats
+live in Grafana (A) or `ccusage` (B); the dial on the desk is the
+ambient summary.
 
-* Instrument cluster layout and annunciator semantics
-* Architecture A: Docker Compose stack, Claude Code env config,
-  PromQL queries, daemon sketch
-* Architecture B: ccusage subprocess integration, watchdog tail,
-  daemon sketch
-* Hardware: X27.168 steppers, SwitecX25 library, ESP32 wiring,
-  enclosure notes
-* Six-phase plan from daemon MVP through enclosure V1
-* Full metrics brainstorm for later phases
+## Documentation
+
+Full documentation is in the [wiki](https://forgejo.labbity.unbiasedgeek.com/archeious/claude-gauge/wiki):
+
+* **Home** — overview and cluster at a glance
+* **Architecture** — two-architecture tradeoff, daemon contract
+* **DataSources** — Docker Compose + PromQL (A), `ccusage` +
+  watchdog (B)
+* **Hardware** — X27.168 steppers, ESP32 wiring, firmware,
+  enclosure
+* **Roadmap** — phases, shipped, deferred
+* **Ideas** — exotic enclosure variants, metrics brainstorm,
+  parked thoughts
+
+Working notes live in [PLAN.md](PLAN.md). Session records and
+in-flight thinking happen there; the wiki is the curated surface.
 
 ## Status
 
-Scaffolded. Phase A pending architecture decision and first issue.
+Scaffolded. Phase A pending architecture decision.