docs(profiles): make user-profiles guide and notebook user-only

Remove leftover agent and regenerate references so the docs match the shipped
v1 SDK: drop the entity_type settings argument and the agent entities example
from the guide, and remove the regenerate demo section and cheat-sheet row from
the notebook.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/platform/features/user-profiles.mdx

@@ -281,10 +281,9 @@ On a project where profiles are turned off, a read returns `status: not_enabled`
 | `enabled` | boolean | Whether profile generation runs for the project |
 | `schema` | object | JSON Schema describing the profile. Every property needs a `description` |
 | `custom_instructions` | string | Extra guidance applied during extraction |
-| `entity_type` | string | Which entity kind `schema` and `custom_instructions` apply to. Defaults to `user` |
 
-`enabled` is project-wide. `schema` and `custom_instructions` belong to one
+`enabled` is project-wide. `schema` and `custom_instructions` apply to user
-entity type, so the stored settings nest them under `entities`:
+profiles, so the stored settings nest them under `entities`:
 
 ```json
 {
@@ -293,8 +292,7 @@ entity type, so the stored settings nest them under `entities`:
     "user": {
       "schema": { "type": "object", "properties": { "...": {} } },
       "custom_instructions": "Prefer durable traits over one-off remarks."
-    },
+    }
-    "agent": { "schema": null, "custom_instructions": null }
   },
   "capabilities": { "full_rebuild": false }
 }

examples/notebooks/user-profiles.ipynb

@@ -149,7 +149,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "`enabled` is project-wide; `schema` and `custom_instructions` belong to one entity kind\n",
+    "`enabled` is project-wide; `schema` and `custom_instructions` apply to user profiles\n",
     "and are stored under `entities`. The SDK takes them flat and nests them for you, so what\n",
     "you write comes back unchanged from `get_profile_settings()`.\n",
     "\n",
@@ -576,31 +576,7 @@
     "when you call `generate_profile()` for them.\n",
     "\n",
     "A field you **remove** stops being maintained: on the next generation, fields your schema\n",
-    "no longer defines are pruned. Keep a field for as long as you want its value kept.\n",
+    "no longer defines are pruned. Keep a field for as long as you want its value kept."
-    "\n",
-    "Rebuilding a whole project in one call is **not available yet**. Check\n",
-    "`capabilities.full_rebuild` before offering it in your own UI — the cell below expects to\n",
-    "be refused, and that refusal is the feature working.\n"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "caps = client.get_profile_settings().get(\"capabilities\", {})\n",
-    "print(\"full_rebuild available:\", caps.get(\"full_rebuild\"))\n",
-    "\n",
-    "if caps.get(\"full_rebuild\"):\n",
-    "    wait_for_job(client.regenerate_profiles())\n",
-    "else:\n",
-    "    try:\n",
-    "        client.regenerate_profiles()\n",
-    "        print(\"ACCEPTED (unexpected)\")\n",
-    "    except Exception as e:\n",
-    "        # 409 not_yet_available. It creates nothing, so nothing was charged.\n",
-    "        print(\"refused as expected:\", str(e)[:200])\n"
    ]
   },
   {
@@ -629,8 +605,8 @@
     "Rejections happen on **write**, where you can see and fix them — not silently at\n",
     "generation time, where you would only notice as an empty profile weeks later.\n",
     "\n",
-    "The last case matters for storage: both entity kinds live in one JSONB column alongside\n",
+    "The last case matters for storage: the user schema lives in one JSONB column alongside\n",
-    "the envelope that separates them, so a schema using the envelope's own reserved keys could\n",
+    "the envelope that separates it, so a schema using the envelope's own reserved keys could\n",
     "not be read back unambiguously. It is refused rather than stored.\n"
    ]
   },
@@ -749,7 +725,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## 8. Cleanup\n",
+    "## 7. Cleanup\n",
     "\n",
     "Removes the demo users. The profile row cascades with the entity.\n"
    ]
@@ -781,10 +757,9 @@
     "| read | `get_profile(user_id)` | free |\n",
     "| one user now | `generate_profile(user_id)` | 1 LLM call |\n",
     "| try a schema | `sample_profiles(limit=n)` | ≤10 real generations, kept |\n",
-    "| everyone | `regenerate_profiles()` | **not available yet** — 409 |\n",
     "| poll a job | `get_profile_job(status_url)` | free |\n",
     "\n",
-    "**Settings are per entity kind.** The stored shape is:\n",
+    "**Settings apply to user profiles.** The stored shape is:\n",
     "\n",
     "```json\n",
     "{\"enabled\": true,\n",