feat(methods): add codeChannels method examples

Add a code_channels method family under methods/src/ demonstrating the typed
codeChannels.* Web API methods: create (spin up a code channel for a session)
and setView (publish a diff to the channel's code tab). Mirrors the existing
per-family layout (manifest with code_channels:manage scope + the code_channels
feature, .slack local app, one script per method) and the typecheck-only
verification approach. Depends on the codeChannels.* methods being available in
slack-sdk.

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

methods/README.md

@@ -19,3 +19,8 @@ $ slack run chat_post_message  # Make the request
 ### chat
 
 - **[chat.postMessage](https://docs.slack.dev/reference/methods/chat.postmessage)**: Sends a message to a channel. [Implementation](./src/chat/chat_post_message.py).
+
+### codeChannels
+
+- **[codeChannels.create](https://docs.slack.dev/reference/methods/codeChannels.create)**: Creates a code channel for a session. [Implementation](./src/code_channels/code_channels_create.py).
+- **[codeChannels.setView](https://docs.slack.dev/reference/methods/codeChannels.setView)**: Publishes a view tab (such as a diff) to a code channel. [Implementation](./src/code_channels/code_channels_set_view.py).

methods/src/code_channels/.slack/.gitignore

@@ -0,0 +1,2 @@
+apps.dev.json
+cache/

methods/src/code_channels/.slack/config.json

@@ -0,0 +1,6 @@
+{
+  "manifest": {
+    "source": "local"
+  },
+  "project_id": "00000000-0000-0000-0000-000000000000"
+}

methods/src/code_channels/.slack/hooks.json

@@ -0,0 +1,5 @@
+{
+  "hooks": {
+    "get-hooks": "python3 -m slack_cli_hooks.hooks.get_hooks"
+  }
+}

methods/src/code_channels/__init__.py

@@ -0,0 +1,20 @@
+import os
+
+from slack_sdk import WebClient
+
+# Read a token from an environment variable
+token = os.environ.get("SLACK_TOKEN")
+
+# Initialize
+client = WebClient(token=token)
+
+# Call the codeChannels.create method to spin up a code channel for a session,
+# rooted at the message that asked for it
+response = client.codeChannels_create(
+    name="Fix flaky login test",
+    origin_channel_id="C123ABC456",
+    origin_message_ts="1717171717.123456",
+)
+
+# Inspect the response
+print(response)

methods/src/code_channels/code_channels_create.py

@@ -0,0 +1,21 @@
+import os
+
+from slack_sdk import WebClient
+
+# Read a token from an environment variable
+token = os.environ.get("SLACK_TOKEN")
+
+# Initialize
+client = WebClient(token=token)
+
+# Call the codeChannels.setView method to publish a diff to the channel's code tab
+response = client.codeChannels_setView(
+    channel_id="C123ABC456",
+    type="diff",
+    content="diff --git a/cron.py b/cron.py\n--- a/cron.py\n+++ b/cron.py\n@@ ...",
+    base_branch="main",
+    head_branch="agent/migrate-cron",
+)
+
+# Inspect the response
+print(response)

methods/src/code_channels/code_channels_set_view.py

@@ -0,0 +1,25 @@
+{
+  "display_information": {
+    "name": "Slack API Methods",
+    "description": "Example implementations to call \"codeChannels\" methods"
+  },
+  "features": {
+    "bot_user": {
+      "display_name": "Slack API Methods",
+      "always_online": true
+    },
+    "code_channels": {
+      "enabled": true
+    }
+  },
+  "oauth_config": {
+    "scopes": {
+      "bot": ["app_mentions:read", "channels:history", "chat:write", "code_channels:manage"]
+    }
+  },
+  "settings": {
+    "org_deploy_enabled": true,
+    "socket_mode_enabled": false,
+    "token_rotation_enabled": false
+  }
+}