review(docs): #1735 patch API spec lines describing awareness_namespace

#1737 deletes the awareness_namespace column from `workspaces` and the
provisioner env injection that backed it. Two API-spec lines still
describe the field as if it were live, which would mislead any
external integrator reading the docs against a post-#1737 backend:

- docs/api-reference.md:106 listed `awareness_namespace` as a column
  on the `workspaces` row.
- docs/api-protocol/platform-api.md:93 claimed workspace creation
  "assigns an awareness_namespace on the workspace row" and the
  namespace is "later injected into the provisioned runtime".

Both are factually wrong post-#1737. Patched.

The broader docs sweep (~30 more references across
`docs/architecture/memory.md`, `docs/agent-runtime/*`, READMEs,
superpowers plans, etc.) is tracked in #1753 as a docs-only
follow-up — those are narrative / handbook copy, not contract.

Refs: #1735 (RFC), #1737 (the backend removal PR this rebases on),
#1753 (docs sweep follow-up), review-finding C3 (API doc contradiction).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/api-protocol/platform-api.md

@@ -90,8 +90,6 @@ Poll `GET /workspaces/:id/delegations` to check results. Each entry includes `de
 
 This is the recommended way for agents to delegate work — it works for all runtimes (Claude Code, LangGraph, etc.) since it operates at the platform level.
 
-Workspace creation also assigns an `awareness_namespace` on the workspace row. That namespace is later injected into the provisioned runtime.
-
 ### Registry
 
 | Method | Path | Description | Auth |

docs/api-reference.md

@@ -103,7 +103,7 @@ Migration files live in `workspace-server/migrations/` (latest: `022_workspace_s
 
 | Table | Description |
 |-------|-------------|
-| `workspaces` | Core entity — status, runtime, `agent_card` JSONB, heartbeat columns, `current_task`, `awareness_namespace`, `workspace_dir` |
+| `workspaces` | Core entity — status, runtime, `agent_card` JSONB, heartbeat columns, `current_task`, `workspace_dir` |
 | `canvas_layouts` | Per-workspace x/y canvas position |
 | `structure_events` | Append-only event log (workspace lifecycle, agent, approval events) |
 | `activity_logs` | A2A communications, task updates, agent logs, errors. `error_detail` is populated by the scheduler so cron run history can surface failure reasons. |