Phase 1: content source of truth — 40 documents across six areas

Satisfies the Phase 1 Definition of Done:

- content/ validates cleanly against the frozen schema. `make validate`
  reports OK: 40 document(s) validated, 0 violations.
- Six areas exist, each with an L1 entry: ai-overview, platform-overview,
  edge-overview, products-overview, history-overview, about-overview.
- All six areas have an L2 entry: ai-systems, platform-estate, edge-fleet,
  products-business, history-engagements, about-narrative.
- 28 L3 artefact stubs under content/<area>/l3/. Every artefacts[].url in
  every document resolves to one of them; the validator proves there are no
  dangling references (and a deliberately broken copy exits 1).
- Every metric value traces to a source line in the evidence notes or the
  approved metric set in reference/content-map.md (per-metric citations are
  recorded in the AUD-131 completion comment).
- Every document carries confidence and last_verified=2026-10-26; the
  validator rejects a missing or non-canonical value.
- docs/content-redaction.md records the redaction pass: identifiers, third
  party personal data, credentials and infrastructure detail excluded, with
  reasons, plus the two numbers that are reported rather than smoothed.

Honesty positions held: 3 businesses active (12 adoptions over time),
Where-Woof deployed and pre-market, failures kept in (edge-failures), no
promotion of in-progress work to delivered.

No site code, no templates, no CSS, no rendering (Phase 2).

content/edge/l3/edge-zigbee.md

@@ -0,0 +1,31 @@
+---
+id: edge-zigbee
+area: edge
+level: 3
+title: "Artefact — Hand-built Zigbee routers and lighting"
+claim: "Two routers built by hand to extend an indoor mesh · feeding nine lighting zones with presence sensing and voice control."
+confidence: running
+period: "2020–"
+tech: [ESP32, Zigbee, Relay, PIR, Radar, Home Assistant]
+metrics: [{label: "hand-built Zigbee routers", value: 2}, {label: "lighting zones", value: 9}]
+artefacts: []
+public: true
+last_verified: 2026-10-26
+tags: [edge, zigbee, lighting, artefact]
+---
+
+# Artefact — Hand-built Zigbee routers and lighting
+
+**Status: stub.** The router build and a zone map land in Phase 7.
+
+## What the artefact is
+
+Two Zigbee routers on ESP32 hardware, built because the commercial mesh did not cover the house and a repeater would have been a black box. Behind them, nine lighting zones: custom presence sensors with PIR and radar for the bathroom and a child's bedroom, a central light controller with a readout and a potentiometer, and a three-button remote with a dial — click on, double click off, dial for level.
+
+## What it proves
+
+Mesh networking understood at the level where you can add a node instead of buying one, and lighting built for how a house is used rather than for a product category.
+
+## When it is delivered
+
+Phase 7. Source: evidence notes section 1.