docs: drop dangling FOCAS refs + link unreferenced v2 design docs

- docs/drivers/FOCAS.md and docs/v2/implementation/focas-wire-protocol.md
  pointed at focas-deployment.md and focas-simulator-plan.md, both of
  which were untracked drafts that have since been removed. Drop the
  refs (the wire-protocol companion now stands on its own; deployment
  guidance lives inline in the FOCAS driver doc).
- Link the orphan v2 design docs from docs/README.md (multi-host
  dispatch, v2 release readiness, the historical lmx-followups tracker)
  and from modbus-test-plan.md (s7.md, mitsubishi.md per-family quirk
  catalogs, sibling to dl205.md).

Surfaced by the doc audit; no content changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/README.md

@@ -95,6 +95,9 @@ Design decisions + phase plans + execution notes. Load-bearing cross-references
 - [v2/driver-specs.md](v2/driver-specs.md) — per-driver addressing + quirks for every shipped protocol
 - [v2/dev-environment.md](v2/dev-environment.md) — dev-box bootstrap
 - [v2/test-data-sources.md](v2/test-data-sources.md) — integration-test simulator matrix (includes the pinned libplctag `ab_server` version for AB CIP tests)
+- [v2/multi-host-dispatch.md](v2/multi-host-dispatch.md) — per-PLC circuit breakers (Phase 6.1 decision #144)
+- [v2/v2-release-readiness.md](v2/v2-release-readiness.md) — release-readiness tracker
+- [v2/lmx-followups.md](v2/lmx-followups.md) — historical Galaxy-bridge follow-ups (pre-PR-7.2)
 - [v2/implementation/phase-*-*.md](v2/implementation/) — per-phase execution plans with exit-gate evidence
 
 ## v1 archive

docs/drivers/FOCAS.md

@@ -2,7 +2,6 @@
 
 Getting-started guide for the FANUC FOCAS2 driver. This is the short path — for
 the exhaustive per-node mapping read [`docs/v2/driver-specs.md §7`](../v2/driver-specs.md),
-for deployment details read [`docs/v2/focas-deployment.md`](../v2/focas-deployment.md),
 for the test-harness map read [FOCAS-Test-Fixture.md](FOCAS-Test-Fixture.md).
 
 ## What it talks to
@@ -210,8 +209,9 @@ latency spike once per cadence.
   driver surface via `FakeFocasClient`. Includes the alarm-projection raise /
   clear diffing tests.
 - **Integration tests** — `tests/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.IntegrationTests/`
-  hold the Docker simulator scaffold (Stream B / C of the simulator plan —
-  `docs/v2/implementation/focas-simulator-plan.md`).
+  hold the Docker simulator scaffold; see
+  [`docs/v2/implementation/focas-wire-protocol.md`](../v2/implementation/focas-wire-protocol.md)
+  for what the simulator emits vs. real CNC behaviour.
 - **E2E script** — `scripts/e2e/test-focas.ps1` stages Host + Proxy + a real
   CNC (or the simulator) and exercises connect → read → write → subscribe
   round-trips. See [`docs/drivers/FOCAS-Test-Fixture.md`](FOCAS-Test-Fixture.md)

docs/v2/implementation/focas-wire-protocol.md

@@ -1,7 +1,6 @@
 # FOCAS wire protocol — what's authoritative vs. what's guessed
 
-Companion to [`focas-simulator-plan.md`](focas-simulator-plan.md). Written during
-Stream B on 2026-04-23 after a research pass through `strangesast/fwlib` +
+Written during Stream B on 2026-04-23 after a research pass through `strangesast/fwlib` +
 public FOCAS documentation. Purpose: separate what we *know* about the FOCAS
 wire protocol (can quote with confidence) from what we're *guessing* (will need
 Wireshark traces to validate in Stream C).

docs/v2/modbus-test-plan.md

@@ -70,6 +70,17 @@ integration tests until reproduced on hardware:
 - TxId drop under load (forum rumour; not reproduced).
 - Pre-2004 firmware ABCD word order (every shipped DL205/DL260 since 2004 is CDAB).
 
+### Siemens SIMATIC S7
+
+Quirk catalog at [`s7.md`](s7.md) — covers S7-1200 / S7-1500 / S7-300 / S7-400 /
+ET 200SP. Modbus TCP isn't native; each platform exposes it via a different
+add-on module with its own register-mapping conventions.
+
+### Mitsubishi MELSEC
+
+Quirk catalog at [`mitsubishi.md`](mitsubishi.md) — Modbus TCP via add-on modules
+across the MELSEC family.
+
 ### Future devices
 
 One section per device class, same shape as DL205. Quirks that apply across