chore: update claude-api skill (#956)

Add shared/model-migration.md and refresh model references, managed
agents docs, and skill description across all language guides.

skills/claude-api/shared/tool-use-concepts.md

@@ -74,7 +74,7 @@ if response.stop_reason == "pause_turn":
     ]
     # Make another API request — server resumes automatically
     response = client.messages.create(
-        model="claude-opus-4-6", messages=messages, tools=tools
+        model="claude-opus-4-7", messages=messages, tools=tools
     )
 ```
 
@@ -171,7 +171,7 @@ Web search and web fetch let Claude search the web and retrieve page content. Th
 ]
 ```
 
-### Dynamic Filtering (Opus 4.6 / Sonnet 4.6)
+### Dynamic Filtering (Opus 4.7 / Opus 4.6 / Sonnet 4.6)
 
 The `web_search_20260209` and `web_fetch_20260209` versions support **dynamic filtering** — Claude writes and executes code to filter search results before they reach the context window, improving accuracy and token efficiency. Dynamic filtering is built into these tool versions and activates automatically; you do not need to separately declare the `code_execution` tool or pass any beta header.
 
@@ -280,7 +280,7 @@ Two features are available:
 - **JSON outputs** (`output_config.format`): Control Claude's response format
 - **Strict tool use** (`strict: true`): Guarantee valid tool parameter schemas
 
-**Supported models:** Claude Opus 4.6, Claude Sonnet 4.6, and Claude Haiku 4.5. Legacy models (Claude Opus 4.5, Claude Opus 4.1) also support structured outputs.
+**Supported models:** Claude Opus 4.7, Claude Sonnet 4.6, and Claude Haiku 4.5. Legacy models (Claude Opus 4.5, Claude Opus 4.1) also support structured outputs.
 
 > **Recommended:** Use `client.messages.parse()` which automatically validates responses against your schema. When using `messages.create()` directly, use `output_config: {format: {...}}`. The `output_format` convenience parameter is also accepted by some SDK methods (e.g., `.parse()`), but `output_config.format` is the canonical API-level parameter.