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Bo 6e873fdd9e docs(gc): teach the four-layer visibility doctrine (#986)
Adds the four-layer visibility doctrine to the GC pack teaching
surfaces, distilled from the 2026-07-22/23 live canary arc where every
stall was invisible to at least one observability layer and visible in
another (three provider wedge classes, all reported "active" by robot
state).

- skills/using-gc: "Visibility: the four layers" — robot state / bead
graph / pane truth / health machinery, each with its command and its
when-it-lies note; disagreement rule (trust the lower layer) tied to the
stall protocol; gc dashboard noted as native aggregation, OTel/Grafana
deferred to 3.3.1.
- deploy/gc/README.md: matching 15-line Visibility block with the core
warning.
- All skill projections regenerated; insertion-only; frontmatter and
mesh projections byte-stable.

RPI: Opus implement, fresh Sol (codex) validator — PASS on all 7
acceptance criteria, verdict.v2 persisted. regen-all --check and
docs-check green (run fresh by both author and validator).
2026-07-23 22:51:18 +00:00
..