docs: add specification, reference docs, workplan, and agent guidance

Adds all Phase 0 content that was created but never committed:
- CLAUDE.md and SCOPE.md — agent and developer orientation
- specs/TailwindForInteractionHubs_v0.2.md — IHF Tailwind coding guide
- docs/ — five IHP v1.5 reference guides (overview, data, controllers, realtime, ihf-mapping)
- workplans/IHUB-WP-0001 — Phase 1 implementation plan (12 tasks, state-hub synced)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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# CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
## Project Overview
**inter-hub** is the reference implementation of the **Interaction Hub Framework (IHF)** — a governed, observable interaction substrate for hub-based AI-enabled software systems. It treats every UI element as a governed artifact, creating a full traceability chain from rendered widget → user interaction → structured feedback → requirement candidate → decision record → implementation change → observed outcome.
**Current state:** Phase 0 (specification) is complete. Phase 1 (Minimal Interaction Core) is the active implementation target. No application code exists yet.
For situational context, read `SCOPE.md`. For architecture depth, read `specs/InteractionHubFrameworkSpecification_v0.1.md`.
## Stack
- **IHP** (Integrated Haskell Platform) v1.5 — full-stack Haskell web framework, server-rendered + optional realtime
- **Haskell** (GHC 9.10) — strongly typed, functional
- **PostgreSQL** — canonical datastore, managed via Nix (no manual DB setup)
- **Nix / devenv** — reproducible environment
- **Tailwind CSS** — see `specs/TailwindForInteractionHubs_v0.2.md` for IHF-specific conventions
## Development Setup
Requires Determinate Nix + direnv:
```bash
# One-time environment setup
curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh
nix profile install nixpkgs#ihp-new
nix profile add nixpkgs#direnv
# Bootstrap IHP project (Phase 1, Task T01)
ihp-new inter-hub
cd inter-hub
devenv up
```
After `devenv up`:
- App server: `http://localhost:8000`
- IHP IDE + Schema Designer: `http://localhost:8001`
## Key Commands
```bash
devenv up # Start dev environment (app + postgres + file watchers)
migrate # Run pending migrations
test # Run tests (auto-creates temp Postgres DB)
make static/prod.js static/prod.css # Production asset bundle
deploy-to-nixos production # NixOS deploy
```
Schema editing: use the IHP IDE at `localhost:8001` or edit `Application/Schema.sql` directly. Code generation via `localhost:8001/Generators`.
## Architecture
### Core Domain Model (Phase 1)
| Entity | Role |
|--------|------|
| `Hub` | Bounded domain of responsibility (Dev Hub, Ops Hub, etc.) |
| `Widget` | Smallest semantically governable interaction unit with stable ID |
| `WidgetVersion` | Version history of widget definitions |
| `InteractionEvent` | Recorded user/agent interaction (viewed, clicked, submitted, etc.) — **append-only** (enforced by PostgreSQL trigger) |
| `Annotation` | Structured comment attached to a widget with category |
| `ViewContext` | Logical location in the UI |
| `CapabilityReference` | Link to hub capability |
### Traceability Chain
```
Widget → InteractionEvent / Annotation
→ RequirementCandidate (Phase 2)
→ DecisionRecord (Phase 3)
→ ImplementationChange → DeploymentRecord → OutcomeSignal
```
### IHP Conventions
- Controllers live in `Web/Controller/`, views in `Web/View/`, types in `Web/Types.hs`
- Schema changes go in `Application/Schema.sql`, then generate with IHP IDE
- Use `AutoRefresh` for operator dashboards (server push on DB change) — not DataSync or Server-Side Components in Phase 1
- See `docs/ihp-ihf-mapping.md` for how IHP capabilities map to IHF requirements
### Widget Envelope
Every rendered widget wraps its HSX in a `widgetEnvelope` helper (Task T08) that injects the stable `widget-id` and `view-context` attributes, enabling client-side event capture without coupling to implementation.
## UI Conventions
All hub interfaces follow the Tailwind layer model in `specs/TailwindForInteractionHubs_v0.2.md`:
```
Semantic Role → Visual Primitive → Tailwind Token → Screen Composition
```
Key rules:
- Every interactive element belongs to a named semantic role (`action-primary`, `nav-item`, `data-cell`, etc.)
- Use spacing rhythm from the spec; do not invent ad-hoc spacing
- State cues (hover, active, disabled, error) follow the defined color roles
## Required Environment Variables
| Variable | Purpose |
|----------|---------|
| `IHP_SESSION_SECRET` | Session encryption key |
| `DATABASE_URL` | Postgres connection string |
| `IHP_BASEURL` | External URL (e.g., `https://example.com`) |
## Active Workplan
Phase 1 work is tracked in `workplans/IHUB-WP-0001-ihf-phase1-minimal-interaction-core.md` (12 tasks, T01T12). Use `/ralph-workplan workplans/IHUB-WP-0001-ihf-phase1-minimal-interaction-core.md` to drive implementation loops.
Phase 1 exit criteria:
- Widgets can be addressed and annotated reliably
- Interaction data is captured with actor attribution and view context
- Hub-level inspection of interaction signals is possible via a dashboard
## Key Reference Docs
| File | Purpose |
|------|---------|
| `SCOPE.md` | Situational guide — in/out of scope, terminology, entry points |
| `specs/InteractionHubFrameworkSpecification_v0.1.md` | Full IHF spec (8 phases, risks, design principles) |
| `specs/TailwindForInteractionHubs_v0.2.md` | Agent-optimized Tailwind coding guide |
| `docs/ihp-overview.md` | IHP v1.5 fundamentals and dev workflow |
| `docs/ihp-data-and-queries.md` | Schema design, auto-generated types, query builder, migrations |
| `docs/ihp-controllers-views-forms.md` | Controller patterns, HSX, forms, validation, auth |
| `docs/ihp-realtime.md` | AutoRefresh vs DataSync vs HTMX decision guide |
| `docs/ihp-ihf-mapping.md` | IHP capability → IHF requirement mapping with schema templates |
## Related Repositories
- `hub-core` — planned shared base package for domain/capability registration
- `the-custodian` — State Hub (decision records, workstreams) that IHF governance integrates with
- Downstream consumers: `dev-hub`, `ops-hub`, `fin-hub`