feat(plugin): add README.md for Claude plugin marketplace listing

transitrix/README.md

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+# Transitrix plugin for Claude Code
+
+Transitrix is a text-native methodology for enterprise architecture: every artefact lives in a versioned YAML file, reviewed as a diff, and governed by a published spec. This plugin brings the methodology's operational surface into Claude Code — scaffolding adopter repositories, turning organisational documents into structured canon candidates, running a read-only repo health check, and producing reproducible compliance reports.
+
+**Install command (once the plugin is published):**
+
+```
+/plugin install transitrix
+```
+
+**Self-hosted install (available now — the `transitrix/methodology` repository acts as a marketplace):**
+
+```
+/plugin marketplace add transitrix/methodology
+/plugin install transitrix@transitrix-methodology
+```
+
+---
+
+## Skills
+
+| Skill | Invocation | What it does | Min methodology version |
+|---|---|---|---|
+| **Onboard** | `/transitrix:onboard` | Scaffolds a new adopter repository (zoned `canon/` + `field/` + `codex/` layout, assistant-neutral `AGENTS.md`, `transitrix.yaml` manifest) and walks through a first notation file | 0.5.0 |
+| **Ingest** | `/transitrix:ingest` | Turns raw organisational documents — interviews, policies, org charts — into `field`-zone artefacts and typed canon candidates, then stages a human review queue | 0.6.0 |
+| **Repo-check** | `/transitrix:repo-check` | Read-only health check: methodology version, coverage-profile resolution, per-TYPE element counts, and integrity flags — all data-free, safe to share externally | 0.6.0 |
+| **Report** | `/transitrix:report` | Produces a reproducible compliance report (obligation × subject impact matrix or per-regime coverage metric) via a committed view-config artefact and the `cervin` CLI renderer | 0.6.0 |
+| **Reg-intel** | `/transitrix:reg-intel` | Monitors regulatory sources, classifies new instruments against the organisation's obligation catalogue, and stages a review digest for human triage | 0.6.0 |
+
+---
+
+## Prerequisites
+
+- **Claude Code** — the plugin runs inside a Claude Code session.
+- **An adopter repository** — a repository following the Transitrix zoned layout (`canon/` + `field/` + `codex/`). Create one with `/transitrix:onboard`, or clone the worked example at `github.com/transitrix/acme-corp`.
+- **Methodology version pin** — the repository must declare its methodology version in `transitrix.yaml`. Skills check the declared version against their `min_version` field and warn if the repo is on an older release.
+- **Transitrix Studio / CLI** (optional) — the `ingest` and `report` skills delegate deterministic work to `@transitrix/ingest-cli` and `cervin` respectively. Both skills run a pre-check (Step 0) and tell the user to install the CLI if it is absent; they do not hand-roll the logic.
+
+---
+
+## What the plugin does not do
+
+- It does not vendor a copy of the methodology canon. When a skill needs the full spec it fetches it from `github.com/transitrix/methodology` via `WebFetch`.
+- It never writes **admitted canon** directly. Admission stays a deliberate human gate (`admitted_by` field). The ingest skill emits candidates and a review queue; the human decides what to promote.
+- It does not run in the background or send data to external services beyond `github.com/transitrix/methodology`.
+
+---
+
+## Methodology
+
+Full specification, notation reference, and migration guides: [`github.com/transitrix/methodology`](https://github.com/transitrix/methodology).
+
+---
+
+## License
+
+MIT — see [`LICENSE`](https://github.com/transitrix/methodology/blob/main/LICENSE) in the methodology repository.