## What
Operator-authorized (Bo, 2026-06-02). Strips the remaining **Gas City**
(`gastown`) coupling from AgentOps and reconciles the **split-doctrine
state** on `main` that the #672–#676 post-mortem flagged: canonical docs
(#676) said NTM+MCP+managed-agents while user-facing docs still
described Gas City as the reference substrate.
The out-of-session substrate is now uniformly **NTM** (local tmux swarm)
+ **MCP** (`ao mcp serve`, shipped) + **managed-agents** (`ao agent`).
AgentOps adopts a substrate; it owns none. Closes **ag-124p** (and
resolves **ag-h93p** — the claude.json gc-hook decouple).
## Deleted (load-bearing surfaces, per the bead's verified scope)
- `packs/agentops/` (the reference City) + root `city.toml`
- `skills/using-gc` + `skills-codex/using-gc` (+
`tests/scripts/using-gc-skill.bats`)
- `gc prime/nudge/mail/hook` wiring in `cli/hooks/claude.json` → now
hookless, matching 3.0 doctrine
## Doc sweep (the split-doctrine fix the post-mortem required)
- **README.md, docs/MIGRATION-3.0.md, docs/dependencies.md,
docs/activation-profiles.md** re-narrated to the substrate trio (the
four files the verdict named)
- AGENTS.md / CLAUDE.md substrate bullets; `dream` skill (+codex twin)
retirement pointer; `shared` / `agent-native` / `using-agentops`
cross-refs; skill-dispositions, context-map, sku-catalog, google-sre
convergence map
## Regenerated derived surfaces
Skill counts (81→80), `registry.json`, `skills/catalog.json`,
context-map, skill-domain-map, codex hashes (14) + manifest, SKILL-TIERS
— all via the generators, validated drift-free.
## Scope boundaries / follow-ups
- **`cli/internal/doctor/fix_bridges.go`** still carries a gc-bridge
detector/fixer subsystem. Out of the bead's verified scope; degrades
gracefully (stat-checks, returns empty when `gc`/`city.toml` absent);
removing it is a test-backed Go change → **follow-up bead**.
- **CLAUDE.md "Gas City bridge — REMOVED"** note kept intentionally:
it's an anti-re-coupling record, not substrate-framing.
- The local-only **bd-closeout** pre-push check (not in CI) is a
pre-existing gap on `main` (its AGENTS.md has no `bd dolt push` line) —
untouched here.
- `thesis-stability` gate FAIL, if present, is the pre-existing
README/PRODUCT/GOALS tagline drift, unrelated to this PR (my
README/PRODUCT edits are the dependency table + skill-count numbers, not
the tagline).
## Verification
`go build ./...` + `go vet` green · skill schema (80/80) + integrity
(heal --strict clean) + lint suite (0 fail) + codex parity green ·
sku-catalog & context-map drift gates green · zero broken markdown links
to deleted paths.
Closes-scenario: ag-124p#gc-coupling-strip
Bounded-context: BC5-Runtime
Evidence: docs/MIGRATION-3.0.md
Rescope PRACTICE.md into PRACTICE-REGISTRY.md: it now owns only the
practice-slug lineage registry, not product positioning or CDLC doctrine.
Update all references (schema, validate-practice-citations.sh, bats test,
architecture-terms.md, documentation-index.md, aggregate.go comment).
Introduce the Context Density Rule as a canonical domain concept: every
high-value context token carries intent, boundary, evidence, decision,
constraint, or next action. New domain entry context-density-rule.md (+
codex mirror). Thread the BDD/Gherkin + DDD + Hexagonal + TDD narrow waist
through cdlc.md, README.md, PRODUCT.md, GOALS.md, and the rpi/domain/
post-mortem skills. Sync codex artifacts.
Bo