feat(agentos): define the authorship-capability floor + family-going-cold detector (#12445) (#12492)

The OQ2 objective of Epic #12440 — the standing target the author-concentration
telemetry + the stale-yield diagnostic (#12444) + the wake legs serve. New sibling
payload authorship-capability-floor.md defines:
- the floor: no active maintainer family may remain structurally unable / cold for
  too long to author in a critical, state-mutating substrate area (Memory Core,
  AiConfig SSOT, wake/orchestrator daemons, release line) — capability, not volume.
- the family-going-cold-in-critical-substrate detector: per-(family x critical-area),
  read from existing provenance, amber on sole-author bus-factor; telemetry never a gate.
- risk framing: primary = bus-factor + skill-atrophy; secondary = perspective-
  monoculture; explicit NON-risk = contribution-imbalance by itself (the FAIR-band line).
author-concentration-detector.md now points to the floor file (concrete pointer, not
just the ticket ref).

Co-authored-by: tobiu <tobiasuhlig78@gmail.com>

Author: neo-opus-ada

.agents/skills/post-review-pickup/references/author-concentration-detector.md

@@ -22,7 +22,7 @@ Telemetry signal for authorship concentration across the swarm. **Successor to t
 
 ## What Firing Means — liveness, not fairness
 
-Concentration firing is a **liveness / capability signal**, not a fairness violation. The productive author is not the problem; the asleep or cold peers are. The response is to make other peers more **live and capable** — never to slow the author down. The routing legs — stale-yield-as-diagnostic, the authorship-capability floor + family-going-cold detector, and wake-substrate liveness hardening — are the sibling sub-tickets of Epic #12440 (#12444 / #12445 / #12446); this payload defines only the telemetry signal they read.
+Concentration firing is a **liveness / capability signal**, not a fairness violation. The productive author is not the problem; the asleep or cold peers are. The response is to make other peers more **live and capable** — never to slow the author down. The routing legs — stale-yield-as-diagnostic, the [authorship-capability floor + family-going-cold detector](./authorship-capability-floor.md), and wake-substrate liveness hardening — are the sibling legs of Epic #12440 (#12444 / #12445 / #12446); this payload defines only the telemetry signal they read.
 
 ## Self-Application When Peers Are Live
 

.agents/skills/post-review-pickup/references/authorship-capability-floor.md

@@ -0,0 +1,23 @@
+# Authorship-Capability Floor (Epic #12440 — the liveness objective)
+
+The standing objective the author-concentration telemetry, the stale-yield diagnostic, and the wake-substrate legs all serve. Graduated from Discussion #12429 (OQ2): the objective is **not** raw authorship *count* (which padding satisfies) — it is a **capability floor + anti-monoculture in state-mutating work**.
+
+## The floor
+
+**No active maintainer family may remain structurally unable — or cold for too long — to author in a critical, state-mutating substrate area.**
+
+"Critical state-mutating" = areas where a wrong change corrupts shared state or the live system (Memory Core graph/storage, AiConfig SSOT, wake / orchestrator daemons, the build/release line) — as opposed to additive / leaf surfaces. The floor is about **capability** (can this family safely author here?), not volume.
+
+## Family-going-cold-in-critical-substrate detector
+
+A maintainer family is **going cold in critical substrate** when, over a sustained window, it has authored and reviewed **zero** changes in a critical state-mutating area that another family actively maintains. The signal is per-`(family × critical-area)`, not global:
+
+- Read from existing provenance (merged-PR authorship + review participation per area) — **no dedicated substrate until recurrence proves it earns one** (per the create-skill discipline).
+- **Amber:** one family is the *sole* author in a critical area across the window (single-family bus-factor in state-mutating work).
+- **Telemetry, never a gate** — same contract as the author-concentration detector: it routes to capability-transfer (the stale-yield diagnostic, #12444), it never blocks, assigns, or throttles a lane.
+
+## Risk framing (what the floor protects against)
+
+- **Primary risk — bus-factor + skill-atrophy in state-mutating work.** If only one family can safely touch a critical area, an outage or drift there has no second author, and the other families' capability in that area decays.
+- **Secondary risk — perspective-monoculture.** One family's blind spots silently become the area's blind spots (e.g. a correlated same-family review miss where both reviewers verify correctness but share the same architectural blind spot).
+- **Explicit NON-risk — contribution-imbalance by itself.** Uneven PR counts are fine; the floor fires only on **capability** gaps in **critical** substrate, never on raw volume. This is the line the retired FAIR-band crossed.