infra/scripts/tg: enforce ingress_factory auth-comment convention

Every `tg plan/apply/destroy/refresh` now runs
`scripts/check-ingress-auth-comments.py` against the current stack
before invoking terragrunt. The check fails closed if any
`auth = "app"` or `auth = "none"` line in the stack's .tf files lacks
an immediately-preceding `# auth = "<tier>": ...` comment documenting
what gates the app (for "app") or why the endpoint is intentionally
public (for "none").

Why tg-level (not git pre-commit): tg is the universal entry point
for all infra changes. CI runs it, headless agents run it, humans
run it. A pre-commit hook only catches the human path. Wiring the
check into tg means the anti-exposure guard fires regardless of who
or what is invoking terragrunt.

Stack-scoped: each stack documents itself the next time it's edited.
The 30+ existing `auth = "none"` stacks that predate this guard are
not blocked from operating today; they'll need the comment added the
next time someone runs `tg plan` on them — at which point the gate
forces a conscious "yes, this is intentional" moment before any
state change can land.

Skipped on: init, fmt, validate, output, etc. — anything that doesn't
read or write infra state.

.claude/CLAUDE.md

@@ -33,7 +33,7 @@ Violations cause state drift, which causes future applies to break or silently r
   - `auth = "app"` — the backend handles its own user authentication (NextAuth, Django, OAuth, bearer-token API, etc.); Authentik would only break it. No middleware attached; the app's own login is the gate. Examples: immich, linkwarden, tandoor, freshrss, affine, actualbudget, audiobookshelf, novelapp. **Functionally identical to `"none"`** — the distinct name exists to record intent at the call site.
   - `auth = "public"` — Authentik anonymous binding via the dedicated `public` outpost (routes via `traefik-authentik-forward-auth-public` → `ak-outpost-public.authentik.svc:9000`). Strangers auto-bound to `guest`; logged-in users keep their identity in `X-authentik-username`. **Only works for top-level browser navigation** — CORS preflight rejects XHR/fetch and automation can't replay the cookie dance. Audit trail, not a gate.
   - `auth = "none"` — no Authentik, no own-auth claim. Use for Anubis-fronted content (Anubis is the gate), native-client APIs (Git, `/v2/`, WebDAV/CalDAV, CardDAV), webhook receivers, OAuth callbacks, and Authentik outposts themselves.
-  - **Anti-exposure rule** (the reason `"app"` exists): only pick `"app"` or `"none"` AFTER you've verified the app has its own user auth (`"app"`) OR the endpoint is intentionally public (`"none"`). Default is `"required"` so accidental omission fails closed. **Convention**: when using `"app"` or `"none"`, add a comment line above the `auth = "..."` line stating what gates the app or why it's public.
+  - **Anti-exposure rule** (the reason `"app"` exists): only pick `"app"` or `"none"` AFTER you've verified the app has its own user auth (`"app"`) OR the endpoint is intentionally public (`"none"`). Default is `"required"` so accidental omission fails closed. **Convention**: when using `"app"` or `"none"`, add a comment line above the `auth = "..."` line stating what gates the app or why it's public. **Enforced by `scripts/tg`**: every `tg plan/apply/destroy/refresh` runs `scripts/check-ingress-auth-comments.py` against the current stack and aborts if any `auth = "app|none"` line lacks the preceding `# auth = "<tier>": ...` comment. Stack-scoped — untouched stacks aren't blocked until they're next edited.
   - **Anti-AI**: on by default when `auth = "none"` or `auth = "app"` (no Authentik to discourage bots); redundant on `"required"` and `"public"`.
   - **DNS**: `dns_type = "proxied"` (Cloudflare CDN) or `"non-proxied"` (direct A/AAAA). DNS records are auto-created — no need to edit `config.tfvars`. Smoke-test target: `echo.viktorbarzin.me` (auth=public, header-reflecting backend).
 - **Anubis PoW challenge** (`modules/kubernetes/anubis_instance/`): per-site reverse proxy that issues a 30-day JWT cookie after a tiny PoW solve. Use for **public, content-bearing sites without app-level auth** (blog, docs, wikis, static landing pages). Pattern: declare `module "anubis" { source = "../../modules/kubernetes/anubis_instance"; name = "X"; namespace = ...; target_url = "http://<backend>.<ns>.svc.cluster.local" }`, then in `ingress_factory` set `service_name = module.anubis.service_name`, `port = module.anubis.service_port`, `anti_ai_scraping = false`. Shared ed25519 key in Vault `secret/viktor` -> `anubis_ed25519_key`; cookie scoped to `viktorbarzin.me` so one solve covers all Anubis-fronted subdomains. **DO NOT put Anubis in front of Git/API/WebDAV/CLI endpoints** — clients without JS can't solve PoW. **Replicas default to 1** because Anubis stores in-flight challenges in process memory; a challenge issued by pod A and solved against pod B errors with `store: key not found` (HTTP 500). Bumping replicas requires wiring a shared Redis store (TODO). For path-level carve-outs (e.g. wrongmove has `/` behind Anubis but `/api` direct), declare a second `ingress_factory` with `ingress_path = ["/api"]` pointing at the bare backend service. Active on: blog, www, kms, travel, f1, cc, json, pb (privatebin), home (homepage), wrongmove (UI only). See `.claude/reference/patterns.md` "Anti-AI Scraping" for full layering.