# handoff.md — HomeOS

> **Status: FINAL (2026-07-17).** This is the authoritative handoff — supersedes any earlier
> draft or chat summary.
>
> **Handoff for the Claude Code session on the server.** This document is the source of truth
> to build the project from scratch on the target VM. Read fully before the first command.
> Starting state of the VM: see §6 (user `nexxo` + sudo, Docker installed, otherwise empty).
> Companion file: `design-mockup.html` (interactive design reference — open in a browser;
> contains all three views: Dashboard, access gate, mobile/PWA layout).
>
> Meta-docs are English; **UI copy is German** (localized DE+EN, see rules). Conventions and
> STRICT RULES are carried over from the user's Clusev project and are **non-negotiable**.

---

## 1. Product

**HomeOS** *(working title — rename is an open decision, see §12)* — a **self-built smart-home
control plane**. Explicitly NOT Home Assistant and not a wrapper around it: own data model, own
integrations, own UI. Single household, self-hosted, LAN-first.

**Core capabilities (full vision):**
- Automatic **device discovery** on the network (mDNS/SSDP/ARP) with an "assign new device" flow
- **Device control** (switches, lights, plugs, power metering; later TVs, covers, …)
- **Rooms** and **persons**: every device/entity assignable to a room and optionally a person
- **Presence detection** (home/away per person) via UniFi + later geofencing, score-based fusion
- **Window/door contact sensors** with status + automations
- **Automations** (trigger → condition → action)
- Live dashboard (Reverb) + later **PWA** on the phone
- Later: settings area protected by **WebAuthn/passkeys** (deferred, see §11)

**v1 scope (build this first — do NOT boil the ocean):**
1. Foundation: Docker stack, auth, design system, device/entity/room model, MQTT ingest,
   Reverb live updates, audit/command log
2. **Shelly integration** (the user's actual hardware today — see §4)
3. Discovery sidecar + "Neue Geräte" assignment flow
4. Presence via **UniFi API** (the user's actual network — see §5)
5. Automations engine (minimal TCA: state-change + time triggers, few actions)

**Deferred (keep OUT of v1):** face recognition entirely (later, maybe), WebAuthn gate,
TV/Chromecast control, Matter, Zigbee (until hardware decision), Ring bridge, native mobile app
(PWA later covers it), energy history charts beyond a simple sparkline.

---

## 2. Tech stack (hard requirements)

| Layer | Choice |
|---|---|
| Framework | **Laravel 13** (current major; user's newer projects run 13 — confirm once, see §12) |
| UI | **Livewire v3** — class-based, **NOT Volt** |
| CSS | **Tailwind v4** (CSS-first, `@theme` in `app.css`, no `tailwind.config.js`) |
| Build | **Vite** |
| Modals | **wire-elements/modal** |
| Realtime | **Laravel Reverb** + Echo — **every channel PRIVATE** |
| Queue/Cache | **Redis** (+ Horizon) |
| DB | **PostgreSQL 17 + TimescaleDB** recommended (telemetry hypertables, compression, retention). Fallback if user prefers stack consistency with Clusev: MariaDB + monthly partitioning + prune job. **Open decision §12 — ask before migrating.** |
| MQTT | **Eclipse Mosquitto 2** (auth + per-client ACLs from day one) |
| MQTT client | **php-mqtt/laravel-client** (^1.8) — subscriber runs as its own Artisan daemon container |
| Discovery | **Python sidecar** container (`network_mode: host`): python-zeroconf (mDNS), async-upnp-client (SSDP), arp-scan — reports via MQTT. PHP cannot do multicast listening from the bridge network. |
| Charts | JS lib as Alpine island (uPlot or ApexCharts) — v1 needs only sparklines |
| Icons | **Lucide**, inline SVG via `x-icon` Blade component — no emoji anywhere |
| Fonts | **Plus Jakarta Sans** (UI) · **IBM Plex Mono** (values, MACs, IPs, timestamps) — **self-hosted woff2 only** (R14) |

Composer: `livewire/livewire wire-elements/modal laravel/reverb laravel/horizon php-mqtt/laravel-client`
NPM: `tailwindcss @tailwindcss/vite laravel-echo pusher-js` (+ chart lib)

---

## 3. Architecture

**MQTT-first hybrid.** Mosquitto is the central bus. Everything that speaks MQTT natively
(Shelly Gen2+, later Zigbee2MQTT, Tasmota, WLED, ring-mqtt) connects directly. Devices without
MQTT get adapters later (HTTP drivers in PHP, or sidecars for TV/Cast/Matter). The UI never
touches protocol topics directly — **always through the DB mapping** (protocol-agnostic).

```
devices ──MQTT──► mosquitto ──► mqtt-listener (artisan daemon)
                                   │  parse + dispatch only (NEVER heavy work in the loop)
                                   ▼
                        Events / Horizon jobs ──► DB upsert (device_states)
                                   │
                                   ▼
                        Reverb (private channels) ──► Livewire UI (Echo)

UI action ──► Livewire ──► DeviceCommand job ──► driver (MqttDriver | HttpDriver) ──► device
                └── every command written to command log (audit)
```

**Data model (core tables):**
- `users`, `rooms`, `persons` (person ↔ user optional link)
- `devices` — identity: uuid (route key, R11), name, vendor, model, protocol, connection config
  (JSON: topic prefix / IP / auth ref), `room_id`, `person_id` nullable, first_seen/last_seen,
  approval state (`discovered` | `active` | `ignored`)
- `entities` — one capability per row: type (`switch`, `light`, `power`, `contact`, `temperature`,
  `humidity`, `motion`, …), capabilities JSON, `device_id`
- `device_states` — CURRENT state only: `entity_id` unique, state JSON, updated_at (pure upserts,
  stays small and fast)
- `telemetry` — history (TimescaleDB hypertable; numeric value column + state JSON). Compression
  + retention policy **from day one** (a 30 s sensor ≈ 1 M rows/year)
- `commands` — audit: who/what switched which entity when (user | automation | physical),
  payload, result. Unverzichtbar for debugging "warum ging das Licht an?"
- `automations` — name, enabled, trigger_type + trigger_config JSON, conditions JSON,
  actions JSON, `cooldown_seconds`, `last_triggered_at` (cooldown from day one — motion sensors
  without debounce flood the queue)
- `presence_signals` + computed person state (see §5)
- `discovery_findings` — raw sidecar reports before a device is approved

**Driver contract:** `app/Support/Drivers/DeviceDriver` interface (`turnOn`, `turnOff`,
`setState`, `capabilities`). v1 implements `ShellyMqttDriver`. Everything else is a later driver
behind the same contract — this is what keeps the system "für alle Produkte brauchbar".

**Broadcasting:** private channels only — `rooms.{uuid}`, `devices.{uuid}`, `presence`,
`discovery`. Authorize in `routes/channels.php`. State changes broadcast with
`ShouldBroadcastNow` (or a dedicated high-priority queue) — a slow job in the default queue must
never delay a light toggle in the UI.

**Long-runners:** `mqtt-listener`, `reverb`, `horizon`, `scheduler` are separate containers off
the same PHP image. MQTT loop rule: parse + dispatch only; reconnect with exponential backoff;
graceful SIGTERM shutdown via pcntl.

---

## 4. Hardware reality (drives the build order)

**Today the user owns: Shelly devices only, plus one Ring product. No Zigbee, no Hue.**

**Shelly (v1 target):**
- Gen2/Gen3 speak JSON-RPC over **MQTT** (enable MQTT in device settings → point at Mosquitto),
  plus HTTP `POST /rpc` and WebSocket. Status arrives on `<device>/status/...`, notifications via
  `rpc_ntf`; commands via RPC (`Switch.Set`, `Light.Set`).
- Discovery: Shellys announce via mDNS (`_shelly._tcp`) and expose `GET /shelly` (identity JSON:
  model, gen, mac) — the sidecar uses both to classify.
- Power metering (PM devices) → `power` entity → dashboard energy tile.
- Docs: shelly-api-docs.shelly.cloud

**Window/door contacts (near future, still Shelly-native):** **Shelly BLU Door/Window**
(Bluetooth) received by any Shelly Gen3 device or a Shelly BLU Gateway acting as BT gateway —
events surface over the same MQTT path. This avoids buying into Zigbee just for contacts.
Zigbee (Zigbee2MQTT + LAN coordinator SLZB-06, never USB passthrough into the Proxmox VM)
remains the documented expansion path if/when the user buys Zigbee hardware.

**Ring (deferred, optional):** no official local API. Established bridge: **ring-mqtt**
(tsightler/ring-mqtt, Docker) — cloud-based, token auth, surfaces motion/ding/contact/camera
events on MQTT. Fits the bus as-is. Cloud dependency must be labeled in the UI (device badge
"Cloud"). Do not build a custom Ring client.

**Later expansion paths (documented, not built):** Hue via local CLIP v2 (HTTPS, HTTP driver in
PHP — existing PHP Hue packages are all deprecated v1 API, don't use them), TVs (LG SSAP /
Samsung Tizen websockets) + Chromecast + **Matter** (matter.js + @matter/mqtt) via a Node
sidecar, Tasmota/WLED native MQTT. The entity/driver model above must never assume Shelly.

---

## 5. Network topology & presence

**Actual network:** Fritz!Box (internet, NAT) → **UniFi Dream Machine** (own NAT — double NAT,
works fine, accepted) → LAN/WLAN with all devices and phones.

Consequences:
- **Presence source of truth = UniFi**, NOT Fritz!Box (phones associate with UniFi WLAN).
  Package: **art-of-wifi/unifi-api-client** (`list_clients()` → MAC, IP, AP, last_seen). UDM =
  UniFi OS console (port 443); create a dedicated read-only local user or API key for HomeOS.
  Fritz!Box TR-064 is irrelevant here (it only sees the UDM as one client).
- Presence engine: "home" immediately on association; "away" only after **5–10 min debounce**
  (`last_seen_at` + scheduler sweep). iPhone WLAN sleep causes false-aways otherwise. Never hang
  a security automation on a single raw signal.
- MAC randomization: private MAC is stable per SSID — onboarding flow assigns "this client =
  person X" from the live UniFi client list instead of asking for hardware MACs.
- Later additions: OwnTracks geofencing (MQTT, fastest clean "left home" signal), score-based
  fusion of UniFi + GPS (+ BLE if ever). v1 = UniFi only.
- **Remote access:** double NAT makes port forwarding annoying (two chained forwards) — use
  **Tailscale** (or WireGuard on the UDM) instead. No open ports. This is also the interim
  answer for "PWA von unterwegs" until a public domain + TLS is set up.
- **WebAuthn (deferred)** will require HTTPS + a real domain (RP ID cannot be an IP; domain
  change invalidates all passkeys) — plan `home.<domain>` + Let's Encrypt DNS-01 via Caddy when
  that phase starts.
- Proxmox: VM NIC on vmbr0, **same L2/VLAN as the smart-home devices**, otherwise
  mDNS/SSDP discovery is blind. If IoT ever moves to its own VLAN → mDNS reflector required.

---

## 6. Docker topology (dev = prod parity, R8 — host has only Docker)

**Starting point on the target VM (already prepared — this is where you begin):**
- User **`nexxo`** exists and has **sudo**. Work as this user.
- **Docker is already installed.** Verify with `docker compose version` as one of the first
  commands; if the compose plugin is missing, report it.
- The VM is otherwise **empty**: no PHP, no Composer, no Node on the host — hence R8, every
  project command runs in containers (bootstrap Laravel via a throwaway container).
- Project root: **`/home/nexxo/homeos`** (own git repo — does not exist yet, create it during
  bootstrap; feature branches, not `main`). Read `HOST_UID`/`HOST_GID` from `id nexxo` into
  `.env` — do not hardcode a UID.

Services in `docker-compose.yml`:

| Service | Role |
|---|---|
| `app` | php-fpm + nginx + Vite (dev) via supervisor — Laravel + Livewire |
| `horizon` | queue workers (same image, `php artisan horizon`) |
| `scheduler` | `php artisan schedule:work` (same image) — presence sweeps, retention, polling fallbacks |
| `reverb` | `php artisan reverb:start` (same image) |
| `mqtt-listener` | `php artisan mqtt:listen` (same image, `restart: always`) |
| `mosquitto` | eclipse-mosquitto:2 — password auth + ACL per client (laravel, sidecar, shelly, later z2m/ring) |
| `db` | timescale/timescaledb:latest-pg17 (or MariaDB — §12) |
| `redis` | redis:7-alpine |
| `discovery` | Python sidecar, **`network_mode: host`** + `cap_add: [NET_RAW]` |

Port planning (host-mode container shares the VM's ports — plan collisions explicitly):
app **:80**, Vite **:5173**, Reverb internal 8080 → host **:6001**, Mosquitto **:1883**
(LAN only), DB bound to 127.0.0.1. All ports env-driven, nothing hardcoded.

Ops non-negotiables:
- **Backups:** Proxmox vzdump for the VM + DB dump job; later `coordinator_backup.json` when
  Zigbee exists. Mosquitto persistence volume.
- **Timezone:** app logic Europe/Berlin, storage UTC; VM NTP-synced (DST double/zero-fire bug
  in time triggers otherwise).
- **Reverb behind proxy:** websocket upgrade headers + long `proxy_read_timeout`, or sockets
  drop every 60 s.
- **Graceful degradation:** server down must never make the home unusable — physical switches
  keep working because Shellys switch locally (detached/relay mode kept functional).

---

## 7. Folder map (R6 — follow exactly)

```
app/
  Livewire/
    Dashboard.php
    Rooms/{Index.php, Show.php}
    Devices/{Index.php, Show.php}
    Discovery/Index.php
    Persons/Index.php
    Automations/{Index.php, Edit.php}
    Settings/Index.php
    Modals/                      # wire-elements/modal (ConfirmDelete, AssignDevice, …)
    Concerns/
  Models/                        # Device, Entity, DeviceState, Room, Person, Automation, Command, DiscoveryFinding
  Support/
    Mqtt/                        # topic mapping, payload normalizers per vendor
    Drivers/                     # DeviceDriver contract + ShellyMqttDriver (+ later drivers)
  Services/                      # DeviceCommandService, PresenceEngine, AutomationEngine, DiscoveryService, UnifiClient
  Events/                        # DeviceStateChanged, DeviceDiscovered, PresenceChanged (ShouldBroadcastNow)
  Jobs/
  Console/Commands/MqttListenCommand.php
resources/
  views/livewire/…               # mirrors app/Livewire, kebab-case
  views/components/              # x-panel, x-kpi, x-status-pill, x-status-dot, x-badge, x-icon,
                                 # x-room-card, x-device-chip, x-toggle, sidebar, topbar
  views/layouts/app.blade.php
  css/app.css                    # @import "tailwindcss"; @theme { tokens §8 }
  fonts/                         # plus-jakarta-sans*.woff2, ibm-plex-mono*.woff2 (Vite-bundled)
  js/app.js                      # Echo bootstrap + Alpine chart islands
lang/{de,en}/                    # common, dashboard, rooms, devices, discovery, persons, automations, settings, modals
routes/web.php                   # full-page Livewire routes, English paths (R13)
routes/channels.php              # private-channel auth
sidecar/                         # Python discovery sidecar (own Dockerfile)
docker/  docker-compose.yml  docker-compose.prod.yml
handoff.md  rules.md  CLAUDE.md  design-mockup.html
```

---

## 8. Design system — "Enterprise Ops, dark OLED"

Reference: **`design-mockup.html`** (open it — it is the approved direction: UniFi/Grafana-class
ops console, NOT a consumer app). Port these tokens verbatim into `@theme` (R3); markup uses
token utilities only.

```css
@theme {
  /* surfaces */
  --color-base:    #080D18;   /* page bg, blue-biased OLED black */
  --color-surface: #0D1424;   /* cards */
  --color-raised:  #121C31;   /* nested surfaces, chips */
  --color-inset:   #18233D;   /* icon wells, kbd */
  /* text ramp */
  --color-ink:     #EAF0FB;
  --color-ink-2:   #93A1BD;
  --color-ink-3:   #5E6C8A;
  /* brand */
  --color-accent:  #4FC1FF;   /* cyan — interaction, active nav, toggles; tints via /10 /25 */
  /* status triad — reserved, never decorative */
  --color-online:  #34D399;
  --color-warning: #FBBF24;
  --color-offline: #F87171;
  /* hairlines */
  --color-line:      #1C2846;
  --color-line-soft: #141E36;
  /* fonts */
  --font-sans: "Plus Jakarta Sans", ui-sans-serif, system-ui;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}
```

Rules of the look: status via colored dot/pill + text (never color alone, never emoji);
**every numeric value, MAC, IP, timestamp in `font-mono` with `tabular-nums`**; hairline borders
instead of shadows; accent used sparingly (one primary action per view); subtle pulse on the
live indicator; `prefers-reduced-motion` respected. Responsive 375/768/1280 (R7): sidebar →
drawer, KPI grid 5→3→2→1, right rail stacks below.

---

## 9. STRICT RULES (carried over — compact form)

> The user's Clusev `rules.md` applies 1:1 to this project (full examples live there).
> Copy this list into `rules.md` in the repo at bootstrap. On any conflict: **STOP and ask.**

- **R1** Pages = full-page class-based Livewire components mapped directly in `routes/web.php`. No page controllers.
- **R2** Livewire class + separate Blade view. **Volt forbidden** (never `make:volt`).
- **R3** All colors/design tokens in `@theme` (`app.css`); markup uses token utilities only — no raw hex/rgb.
- **R4** No inline `style=` — single exception: progress-bar `width`.
- **R5** Destructive/confirm actions via **wire-elements/modal** — never `confirm()`/Alpine popups.
- **R6** Files exactly per folder map (§7).
- **R7** Responsive verified at 375/768/1280; touch targets ≥ 44 px.
- **R8** Every PHP/Composer/Node/artisan command **inside the container** — host has only Docker.
- **R9** UI copy German, terse/operational, **no emoji**; status via color/dots/pills; technical tokens stay native.
- **R10** Reuse `@theme` tokens + Blade component kit — no ad-hoc colors/widgets.
- **R11** URL-exposed records addressed by **UUID**, never integer PK (`getRouteKeyName(): 'uuid'`).
- **R12** Every touched page verified in a real browser: **HTTP 200, zero console errors, zero failed requests**; loaded state of lazy pages, not the skeleton; inspect rendered DOM for leaked `@`/`{{ }}`/`group.key` literals. Green `Livewire::test` ≠ done.
- **R13** Route paths + names **English** (`/devices`, not `/geraete`); German only in visible labels.
- **R14** Fonts **self-hosted** (`resources/fonts/*.woff2`, relative `url('../fonts/…')` + `@font-face`) — no Google Fonts/CDN link or import.
- **R15** **Codex review** (`/codex:review`) after every change — no errors, no security findings, else fix and re-run. Task not done until clean.
- **R16** Every UI string localized `lang/{de,en}/<group>.php`, identical keys both languages, `__('group.key')` — no hard-coded copy anywhere.
- **R17** Blade: block `@php … @endphp` only (no inline `@php(...)`); never the literal directive tokens in comments/text.
- **Secrets:** `.env*`, tokens, keys never staged; check `git status` before every commit.
  Git repo does not exist yet — create it at bootstrap (feature branches, not `main`).

**HomeOS-specific additions:**
- **H1** UI/Livewire never publishes to protocol topics directly — every command goes through
  `DeviceCommandService` → driver, and every command is written to the `commands` audit table.
- **H2** MQTT subscriber callbacks: parse + dispatch only. No DB aggregation, no HTTP calls in
  the loop.
- **H3** Vendor specifics (topics, payload shapes) live only in `Support/Mqtt` + `Support/Drivers`.
  Models, Livewire and views stay protocol-agnostic.
- **H4** Telemetry writes go through one ingest path that enforces retention/compression policies.
- **H5** Automations always carry `cooldown_seconds`; the engine has a **dry-run mode** (log
  instead of switch) for development — never develop automations against the live home.

---

## 10. Claude Code plugin setup (server session — do this FIRST, before Phase 1)

The server session must mirror the user's local Claude Code plugin set and **use** these
plugins during the build. At session start:

1. **Add the external marketplaces**, then install:

| Plugin | Marketplace / source | Install |
|---|---|---|
| superpowers | `claude-plugins-official` (built-in) | `/plugin install superpowers@claude-plugins-official` |
| frontend-design | `claude-plugins-official` | `/plugin install frontend-design@claude-plugins-official` |
| code-review | `claude-plugins-official` | `/plugin install code-review@claude-plugins-official` |
| context7 | `claude-plugins-official` | `/plugin install context7@claude-plugins-official` |
| codex | `/plugin marketplace add openai/codex-plugin-cc` | `/plugin install codex@openai-codex` |
| claude-mem | `/plugin marketplace add thedotmack/claude-mem` | `/plugin install claude-mem@thedotmack` |
| ui-ux-pro-max | `/plugin marketplace add nextlevelbuilder/ui-ux-pro-max-skill` | `/plugin install ui-ux-pro-max@ui-ux-pro-max-skill` |
| caveman | `/plugin marketplace add JuliusBrussee/caveman` | `/plugin install caveman@caveman` |

2. **Use them, don't just install them:** superpowers workflows (brainstorming before creative
   work, TDD, systematic debugging, writing/executing plans), frontend-design + ui-ux-pro-max
   for every UI task (§8 design system), code-review + **codex for R15** (mandatory review
   gate), claude-mem for cross-session memory, context7 for current library docs
   (Laravel/Livewire/Tailwind APIs — don't answer from training data), caveman optional.
3. **Anything missing → install it.** If an install fails, a plugin needs a runtime it can't
   find, or **any tool requires a login/authentication** (Codex CLI login, API keys, tokens,
   Gitea credentials, UniFi access) → **stop and report to the user**; never skip silently or
   work around it. Because R15 depends on Codex, verify `/codex:setup` during bootstrap, not
   when the first review is due.
4. Scope note: plugin runtimes (node/python for claude-mem, ui-ux-pro-max) belong to the Claude
   Code session on the host — R8 (everything in containers) applies to **project** tooling, not
   to session tooling.

---

## 11. Deferred decisions already researched (do not re-litigate, just don't build yet)

- **Face recognition:** postponed entirely. When it returns: **WebAuthn/passkeys**
  (spatie/laravel-passkeys or asbiin/laravel-webauthn) is the security gate — browser-based
  DIY liveness is not securable (virtual cameras, replay, deepfakes). Camera face recognition
  only ever as comfort/personalization layer, never as the lock.
- **Zigbee:** if bought, Zigbee2MQTT + **SLZB-06 LAN coordinator** (PoE), never USB passthrough
  into the Proxmox VM. Zigbee channel chosen against WLAN channels BEFORE first pairing.
- **Matter/TVs/Cast:** Node/Python sidecars speaking MQTT — never native PHP implementations.
- **Mobile:** PWA first (manifest + service worker + Web Push via
  laravel-notification-channels/webpush; iOS supports Web Push for installed PWAs). Expo/React
  Native only if a concrete PWA limit hurts. NativePHP rejected (runs a second Laravel on the
  phone — wrong model).

---

## 12. Open decisions — ask the user before committing

1. **DB:** PostgreSQL+TimescaleDB (recommended for telemetry) vs MariaDB (Clusev consistency)?
2. **Laravel version:** 13 assumed (current, Clusev precedent) — original statement said 12.
3. **Project name:** "HomeOS" is a working title.
4. **Git remote:** Gitea like Clusev (`git.bave.dev`)? Repo must be created at bootstrap.
5. **UniFi auth:** local read-only user vs API key on the UDM — needs the user to create it.
6. **Which Ring product** the user owns (relevant only when the ring-mqtt phase starts).

---

## 13. Build order (each phase ends browser-verified, R12 + R15; §10 plugin setup comes first)

1. **Bootstrap** — compose stack up, Laravel installed in-container, git repo + `rules.md` +
   `CLAUDE.md` created, tokens + fonts + layout shell (sidebar/topbar per mockup), auth + login.
2. **Domain core** — migrations for §3 tables, models, seeders with fake devices; dashboard
   renders mock state (rooms, KPI row, live feed) — mock first, real hardware after.
3. **MQTT ingest** — mosquitto + mqtt-listener daemon; Shelly state flows into
   `device_states`; Reverb pushes to the dashboard; toggle switches a real Shelly via
   `ShellyMqttDriver`; commands audited.
4. **Discovery** — Python sidecar (mDNS/SSDP/ARP → MQTT), `discovery_findings`, "Neue Geräte"
   panel with assign/ignore flow (per mockup).
5. **Presence** — UnifiClient poller (scheduler), person↔client mapping UI, debounce sweep,
   presence panel + avatars live.
6. **Automations** — TCA engine (state_change + time triggers; actions: switch entity, notify),
   cooldown, dry-run mode, audit integration.
7. **Polish + PWA prep** — empty states, `wire:init` loading states, breakpoints pass,
   manifest groundwork.

Definition of done per phase: R12 browser proof (200, console clean, all 3 breakpoints) +
R15 Codex clean + commit on a feature branch.