site: cut the template's own labels out of the pages

Point 7 of the page-wording review. The pages no longer show their data
structure as headings, and they no longer explain their own conventions.

- Level 1 is one screen: claim, status badge, three figures, the technology
  row, and one sentence carrying one link. Measured in headless Chrome at
  1440x900: 1404-1845 px tall before, exactly 900 px (no scroll) after, on
  all six area pages.
- DocPage: no kicker line, no visible level label, no "Evidence for this
  page" heading or instruction note, no "Drill-downs" list, no
  "Status <word> - sentence" footer. The artefact table starts at level 2,
  under the heading "Artefacts"; the history timeline is level 2 only.
- Landing page: "Start here" link text gone, "How to read this site" panel
  gone, the footer's status-label explainer gone.
- Content, presentation only, no claim softened: the leading H1 that
  duplicated the page title removed from all 41 documents; level 1 bodies
  reduced to the constraint as ordinary prose plus the way in;
  "**Status: ...**" prefixes removed from the artefact stubs; "## Drill-downs"
  and "## Period and confidence" removed from the level 2 pages, with the
  cross-area links moved into the prose.
- The six level 1 claims are now sentences with a subject, and use commas
  instead of middots. Same facts, no new ones.

Not in this commit: the 35 level 2 and 3 claims still use the compact CV
style. That is a voice decision for Sam, not a wording tidy-up.

make validate: 41 documents, 0 violations. go test ./...: pass.

(cherry picked from commit 03009f80fc7815ad7719412e125df9297a6e653f)

content/edge/l3/edge-architecture.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, architecture, power, artefact]
 ---
 
-# Artefact — Edge architecture · power · radio · deep sleep
-
-**Status: stub.** One annotated diagram of a representative node and the radio path lands in Phase 7.
+One annotated diagram of a representative node and the radio path lands in Phase 7.
 
 ## What the artefact is
 

content/edge/l3/edge-failures.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, failures, artefact]
 ---
 
-# Artefact — The failures · kept in the record
-
-**Status: in progress.** Two items are being rebuilt, one is postponed. The page is not finished because the work is not finished.
+Two items are being rebuilt, one is postponed. The page is not finished because the work is not finished.
 
 ## What the artefact is
 

content/edge/l3/edge-front-door.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, doorbell, vision, voice, artefact]
 ---
 
-# Artefact — Front door · vision · voice · and a rebuild
-
-**Status: in progress.** The device was built and is being rebuilt. The page states this rather than describing it as finished.
+The device was built and is being rebuilt. The page states this rather than describing it as finished.
 
 ## What the artefact is
 

content/edge/l3/edge-lora-sprinkler.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, lora, solar, irrigation, artefact]
 ---
 
-# Artefact — LoRa irrigation under solar power
-
-**Status: stub.** The bill of materials and the wake-on-radio change land in Phase 7.
+The bill of materials and the wake-on-radio change land in Phase 7.
 
 ## What the artefact is
 

content/edge/l3/edge-sensors.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, sensors, actuation, artefact]
 ---
 
-# Artefact — Sensors and actuation
-
-**Status: stub.** A sensor and actuator table lands in Phase 7.
+A sensor and actuator table lands in Phase 7.
 
 ## What the artefact is
 

content/edge/l3/edge-snapcast.md

@@ -14,9 +14,7 @@ last_verified: 2026-10-26
 tags: [edge, audio, snapcast, artefact]
 ---
 
-# Artefact — Distributed audio · eight endpoints with ducking
-
-**Status: stub.** The topology diagram and a short recording of ducking land in Phase 7.
+The topology diagram and a short recording of ducking land in Phase 7.
 
 ## What the artefact is
 

content/edge/l3/edge-zigbee.md

@@ -14,9 +14,7 @@ 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.
+The router build and a zone map land in Phase 7.
 
 ## What the artefact is