chore(schemas): sync to AdCP 3.0.5 — identity.additionalProperties: true (#374)

Bumps src/adcp/ADCP_VERSION 3.0.4 -> 3.0.5 and regenerates schemas,
generated types, ergonomic coercion, and bundled _schemas/.

Upstream 3.0.5 is three additive changes; only one matters at the SDK
type-system level:

- spec(capabilities): identity.additionalProperties relaxed from false
  to true on get-adcp-capabilities-response. Backports the relaxation
  already on main post-#3690 so 3.0-pinned adopters of identity.brand_json_url
  stop being rejected by strict 3.0 validators.

  Concrete diff: Identity Pydantic model_config flips from extra='forbid'
  to extra='allow'. Receivers reading the new field via model_extra
  (or downstream raw-JSON paths) gain forward-compat without waiting
  for 3.1.

Other 3.0.5 items (storyboard default_agent, brand-rights conformance
field-name fix, release-pipeline plumbing) are runner-side or upstream
release machinery — no Python SDK surface area.

Closes the spec-side gate identified on #344. The five expert design
blockers on that issue (SSRF on all 3 hops, identity_posture/consistency
provenance, PSL extra, async-first surface, CLI alias collision) are
unrelated to this sync.

Local gates:
- ruff check src/ - clean
- mypy src/adcp/ - 744 source files, no issues
- pytest tests/ - 3095 passed, 26 skipped, 1 xfailed

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

Author: bokelley

schemas/cache/a2ui/bound-value.json

@@ -1,6 +1,5 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "$id": "/schemas/3.0.4/a2ui/bound-value.json",
   "title": "A2UI Bound Value",
   "description": "A value that can be a literal or bound to a path in the data model",
   "oneOf": [
@@ -13,7 +12,9 @@
           "description": "Static string value"
         }
       },
-      "required": ["literalString"],
+      "required": [
+        "literalString"
+      ],
       "additionalProperties": false
     },
     {
@@ -25,7 +26,9 @@
           "description": "Static number value"
         }
       },
-      "required": ["literalNumber"],
+      "required": [
+        "literalNumber"
+      ],
       "additionalProperties": false
     },
     {
@@ -37,7 +40,9 @@
           "description": "Static boolean value"
         }
       },
-      "required": ["literalBoolean"],
+      "required": [
+        "literalBoolean"
+      ],
       "additionalProperties": false
     },
     {
@@ -49,7 +54,9 @@
           "description": "JSON pointer path to value in data model (e.g., '/products/0/title')"
         }
       },
-      "required": ["path"],
+      "required": [
+        "path"
+      ],
       "additionalProperties": false
     },
     {
@@ -63,8 +70,11 @@
           "type": "string"
         }
       },
-      "required": ["literalString", "path"],
+      "required": [
+        "literalString",
+        "path"
+      ],
       "additionalProperties": false
     }
   ]
-}
+}

schemas/cache/a2ui/component.json

@@ -1,6 +1,5 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "$id": "/schemas/3.0.4/a2ui/component.json",
   "title": "A2UI Component",
   "description": "A component in an A2UI surface",
   "type": "object",
@@ -24,6 +23,9 @@
       }
     }
   },
-  "required": ["id", "component"],
+  "required": [
+    "id",
+    "component"
+  ],
   "additionalProperties": true
-}
+}