docs(ecosystem): scrub private service-binding + repo references

Follow-up to docs#15 (outbound disclosure policy). Removes the last
pre-existing leaks in ecosystem.md that were explicitly called out as
out-of-scope in the original policy PR:

- Service Map: tarotscript-worker / img-forge-gateway (wrangler
  binding identifiers) → "internal service binding"
- Authentication: edge-auth (private repo name) → "Stackbilt Auth"
  (the public service capability). auth.stackbilt.dev is fine to
  reference as the public domain.

Functional info (centralized auth, RPC binding latency, subdomain)
is preserved. Private repo and binding names are not.

Closes Stackbilt-dev/codebeast#32.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AEGIS

src/content/docs/ecosystem.md

@@ -26,8 +26,8 @@ Charter is the open-source CLI. Stackbilder and img-forge are commercial service
 | Service | Domain | Purpose |
 |---------|--------|---------|
 | **Stackbilder Platform** | `stackbilder.com` | Product frontend, Astro server API routes, service binding gateway |
-| **TarotScript** | `tarotscript-worker` (service binding) | Deterministic scaffold engine — intent classification, scaffold-cast spreads, grimoire persistence |
-| **img-forge** | `img-forge-gateway` (service binding) | AI image generation API, async job queue, R2 image storage |
+| **TarotScript** | internal service binding | Deterministic scaffold engine — intent classification, scaffold-cast spreads, grimoire persistence |
+| **img-forge** | internal service binding | AI image generation API, async job queue, R2 image storage |
 | **Auth** | `auth.stackbilt.dev` | Centralized auth — OAuth (GitHub/Google), session management, API keys, quota, billing |
 | **AEGIS** | `aegis.stackbilt.dev` | Persistent AI agent framework — see [aegis-oss](https://github.com/Stackbilt-dev/aegis-oss) |
 | **Docs** | `docs.stackbilder.com` | Documentation (this site) |
@@ -120,13 +120,13 @@ See [img-forge API](/img-forge) for the full REST and MCP reference.
 
 ## Authentication
 
-All services use edge-auth (`auth.stackbilt.dev`) for centralized authentication:
+All services use Stackbilt Auth (`auth.stackbilt.dev`) for centralized authentication:
 
 - **OAuth** — GitHub and Google sign-in via Better Auth
 - **Session cookies** — `better-auth.session_token`, validated via RPC service binding
 - **API keys** — `ea_*`, `sb_live_*`, `sb_test_*` prefixes for programmatic access
 
-The platform frontend (`stackbilder.com`) validates sessions via an RPC binding to edge-auth — near-zero latency, no HTTP hop.
+The platform frontend (`stackbilder.com`) validates sessions via an RPC binding to the Stackbilt Auth service — near-zero latency, no HTTP hop.
 
 ## Pricing