Add hephaestus sync hub to indri (launchagent, PWA, device-code OIDC) (#369)

Makes indri the canonical **heph** hub for the hub-and-spoke task/context system, deployed as a self-updating LaunchAgent managed by Ansible. Other devices (gilbert) attach as offline-capable spokes.

## What's here
- **`ansible/roles/heph`** (tag `heph`) — bootstrap `cargo install hephd` (only if absent; `--self-update` keeps it current after), version-pinned `heph-pwa` checkout served via `--web-root`, launchagent `mcquack.eblume.heph`:
  ```
  hephd --mode server --http-addr 0.0.0.0:8787 --db … --web-root …
        --oidc-issuer …/o/heph/ --oidc-audience heph
        --self-update --self-update-interval-secs 600
  ```
  `~/.cargo/bin` is on the agent `PATH` so self-update's `cargo install` works.
- **Caddy** — `heph.ops.eblu.me → localhost:8787` (TLS for the PWA secure context).
- **Authentik** — new `heph` **public device-code** OIDC app + `default-device-code-flow` bound to the default brand's `flow_device_code` (verified live: brand `authentik-default`, field currently unset → additive).
- **Docs** — `services/hephaestus.md` (Path-A seeding runbook + spoke caveat), `indri.md`, changelog fragment.

## Three features requested
- **Autoupdate** — 10-min interval (`--self-update-interval-secs 600`).
- **PWA** — `--web-root` (confirmed shipped in v1.2.0).
- **Spoke** — gilbert reconfig documented (post-merge step).

## Deploy plan (not done yet — awaiting review)
1. Seed from gilbert (Path A): `heph daemon stop` → copy `heph.db` → `DELETE FROM meta WHERE key='origin'`.
2. Sync Authentik `apps`/blueprint; verify blueprint status via API (not just logs).
3. `provision-indri --tags heph,caddy` from this branch.
4. Point gilbert at the hub + `heph auth login`.

## Known follow-ups (heph-side, tracked in the Hephaestus project)
- `heph daemon` can't bake hub/spoke config or pass `--self-update-interval-secs` → worked around by the ansible plist.
- Path-A seeding lacks a clean `hephd --owner-id`/seed command → manual `meta.origin` reset for now.
- Self-update moves hephd ahead of the ansible-pinned PWA shell over time (drift; tolerated by the SW cache, revisit on next release).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #369

argocd/manifests/authentik/configmap-blueprint.yaml

@@ -434,3 +434,82 @@ data:
           provider: !KeyOf mealie-provider
           meta_launch_url: https://meals.ops.eblu.me
           policy_engine_mode: all
+
+  heph.yaml: |
+    version: 1
+    metadata:
+      name: BlumeOps Heph SSO
+      labels:
+        blueprints.goauthentik.io/description: "Hephaestus hub OIDC (device-code) provider, application, and device-code flow"
+    entries:
+      # Device-code flow (RFC 8628). authentik ships no default for this, so we
+      # create one and bind it to the brand below. An empty stage_configuration
+      # flow is sufficient: the already-authenticated user just confirms the code.
+      - model: authentik_flows.flow
+        id: device-code-flow
+        identifiers:
+          slug: default-device-code-flow
+        attrs:
+          name: Device code flow
+          title: Device code flow
+          slug: default-device-code-flow
+          designation: stage_configuration
+          authentication: require_authenticated
+
+      # Enable the device-code grant globally by binding the flow to the default
+      # brand (domain authentik-default). Partial update — only sets this field.
+      - model: authentik_brands.brand
+        identifiers:
+          domain: authentik-default
+        attrs:
+          flow_device_code: !KeyOf device-code-flow
+
+      # OAuth2 provider for heph — PUBLIC client (device-code + PKCE, no secret).
+      # client_id doubles as the token audience the hub verifies (--oidc-audience heph),
+      # and the app slug 'heph' is the issuer path (/application/o/heph/).
+      - model: authentik_providers_oauth2.oauth2provider
+        id: heph-provider
+        identifiers:
+          name: Heph
+        attrs:
+          name: Heph
+          authorization_flow: !Find [authentik_flows.flow, [slug, default-provider-authorization-implicit-consent]]
+          invalidation_flow: !Find [authentik_flows.flow, [slug, default-provider-invalidation-flow]]
+          client_type: public
+          client_id: heph
+          # Device-code (RFC 8628) + PKCE use no redirect, but the provider
+          # serializer requires the field — an empty list satisfies it.
+          redirect_uris: []
+          signing_key: !Find [authentik_crypto.certificatekeypair, [name, authentik Self-signed Certificate]]
+          property_mappings:
+            - !Find [authentik_providers_oauth2.scopemapping, [scope_name, openid]]
+            - !Find [authentik_providers_oauth2.scopemapping, [scope_name, email]]
+            - !Find [authentik_providers_oauth2.scopemapping, [scope_name, profile]]
+          sub_mode: hashed_user_id
+          include_claims_in_id_token: true
+
+      # Heph application — linked to the OAuth2 provider
+      - model: authentik_core.application
+        id: heph-app
+        identifiers:
+          slug: heph
+        attrs:
+          name: Hephaestus
+          slug: heph
+          provider: !KeyOf heph-provider
+          meta_launch_url: https://heph.ops.eblu.me
+          policy_engine_mode: any
+
+      # Policy binding — restrict heph to admins group (single-owner, sensitive data)
+      - model: authentik_policies.policybinding
+        identifiers:
+          order: 0
+          target: !KeyOf heph-app
+          group: !Find [authentik_core.group, [name, admins]]
+        attrs:
+          target: !KeyOf heph-app
+          group: !Find [authentik_core.group, [name, admins]]
+          order: 0
+          enabled: true
+          negate: false
+          timeout: 30