feat(profiles): SDK methods and docs for entity profiles

Adds the profile surface to both SDKs and documents it.

Python (MemoryClient + AsyncMemoryClient) and TypeScript gain:
get/generate profile, get/update settings, sample, regenerate.

A profile's keys come from the customer's own JSON Schema, so the TS
client keeps `profile` opaque and passes `schema` through untouched in
both directions. Camel-casing them would return field names that do not
match the schema the customer wrote.

Reads use the v2 envelope, where a known entity with no profile yet is a
200 carrying a status rather than a 404, so an empty state is
distinguishable from an error.

Verified against a live environment running this API: settings
round-trip, a partial update leaves the schema intact, generation
produces a profile under the configured schema, and sample, regenerate,
cooldown and the 400/404 paths all answer as documented.

docs/docs.json

@@ -71,6 +71,7 @@
                         "pages": [
                           "platform/features/v2-memory-filters",
                           "platform/features/entity-scoped-memory",
+                          "platform/features/user-profiles",
                           "platform/features/graph-memory",
                           "platform/features/async-client",
                           "platform/features/multimodal-support",
@@ -511,6 +512,18 @@
                       "api-reference/entities/delete-user"
                     ]
                   },
+                  {
+                    "group": "Profiles",
+                    "icon": "id-card",
+                    "pages": [
+                      "api-reference/profiles/get-profile",
+                      "api-reference/profiles/trigger-profile",
+                      "api-reference/profiles/get-profile-settings",
+                      "api-reference/profiles/update-profile-settings",
+                      "api-reference/profiles/sample-profiles",
+                      "api-reference/profiles/regenerate-profiles"
+                    ]
+                  },
                   {
                     "group": "Organizations",
                     "icon": "building",