Establish Railiance Fabric graph model

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# railiance-fabric — Agent Instructions
## Repo Identity
**Purpose:** Railiance Fabric defines the repo-owned declaration model, validation tooling, graph queries, and State Hub export contract for the Railiance ecosystem graph.
**Domain:** railiance
**Repo slug:** railiance-fabric
**Topic ID:** `ca369340-a64e-442e-98f1-a4fa7dc74a38`
**Workplan prefix:** `RAIL-FAB-WP-`
---
## State Hub Integration
The Custodian State Hub tracks work across all domains. Interact via HTTP REST —
there is no MCP server for Codex agents.
| Context | URL |
|---------|-----|
| Local workstation | `http://127.0.0.1:8000` |
| Remote via tunnel | `http://127.0.0.1:18000` |
### Orient at session start
```bash
# Offline brief — works without hub connection
cat .custodian-brief.md
# Active workstreams for this domain
curl -s "http://127.0.0.1:8000/workstreams/?topic_id=ca369340-a64e-442e-98f1-a4fa7dc74a38&status=active" \
| python3 -m json.tool
# Check inbox
curl -s "http://127.0.0.1:8000/messages/?to_agent=railiance-fabric&unread_only=true" \
| python3 -m json.tool
```
Mark a message read:
```bash
curl -s -X PATCH "http://127.0.0.1:8000/messages/<id>/read" \
-H "Content-Type: application/json" -d '{}'
```
### Log progress (required at session close)
```bash
curl -s -X POST http://127.0.0.1:8000/progress/ \
-H "Content-Type: application/json" \
-d '{
"summary": "what was done",
"event_type": "note",
"author": "codex",
"workstream_id": "<uuid>",
"task_id": "<uuid>"
}'
```
Omit `workstream_id` / `task_id` when not applicable.
### Update task status
```bash
curl -s -X PATCH "http://127.0.0.1:8000/tasks/<task_id>" \
-H "Content-Type: application/json" \
-d '{"status": "in_progress"}'
# values: todo | in_progress | done | blocked
```
### Flag a task for human review
```bash
curl -s -X PATCH "http://127.0.0.1:8000/tasks/<task_id>" \
-H "Content-Type: application/json" \
-d '{"needs_human": true, "intervention_note": "reason"}'
```
---
## Session Protocol
**Start:**
1. `cat .custodian-brief.md` — domain goal and open workstreams (offline-safe)
2. Check inbox: `GET /messages/?to_agent=railiance-fabric&unread_only=true`; mark read
3. Scan workplans: `ls workplans/` — note `status: active` files and open tasks
4. Check blocked tasks: `GET /tasks/?needs_human=true`
**During work:**
- Update task statuses in workplan files as tasks progress
- Record significant decisions via `POST /decisions/`
**Close:**
1. Update workplan file task statuses to reflect progress
2. Log: `POST /progress/` with a summary of what changed
3. Note for the custodian operator: after workplan file changes, run from
`~/the-custodian/state-hub`:
```bash
make fix-consistency REPO=railiance-fabric
```
This syncs task status from files into the hub DB.
---
## Workplan Convention (ADR-001)
Work items originate as files in this repo — not in the hub. The hub is a
read/cache/index layer that rebuilds from files.
**File location:** `workplans/RAIL-FAB-WP-NNNN-<slug>.md`
**Archived location:** completed workplans may move to
`workplans/archived/YYMMDD-RAIL-FAB-WP-NNNN-<slug>.md`. The `YYMMDD` prefix is
the completion/archive date; the frontmatter `id` does not change.
**Ad Hoc Tasks:** small opportunistic fixes discovered during a session use
`workplans/ADHOC-YYYY-MM-DD.md` with task ids `ADHOC-YYYY-MM-DD-T01`, etc. Use
this only for low-risk work completed directly; create a normal workplan for
anything needing analysis, design, approval, dependencies, or multiple phases.
**Frontmatter:**
```yaml
---
id: RAIL-FAB-WP-NNNN
type: workplan
title: "..."
domain: railiance
repo: railiance-fabric
status: active | done
owner: codex
topic_slug: ...
created: "YYYY-MM-DD"
updated: "YYYY-MM-DD"
state_hub_workstream_id: "<uuid>" # written by fix-consistency — do not edit
---
```
**Task block format** (one per `##` section):
```
## Task Title
` ` `task
id: RAIL-FAB-WP-NNNN-T01
status: todo | in_progress | done | blocked
priority: high | medium | low
state_hub_task_id: "<uuid>" # written by fix-consistency — do not edit
` ` `
Task description text.
```
Status progression: `todo` → `in_progress` → `done` (or `blocked`)
To create a new workplan:
1. Write the file following the format above
2. Notify the custodian operator to run `make fix-consistency REPO=railiance-fabric`
(or send a message to the hub agent via `POST /messages/`)