[SK-2195] feat(mcp): mint session tokens for a connection's MCP server

.changes/unreleased/added-20261009-153301-mcp-connection-session-token.yaml

@@ -0,0 +1,18 @@
+kind: added
+body: |
+  `scalekit.actions.mcp.createSessionToken({ connectionName, identifier, expirySeconds?, accessLevel? })` mints a session token for a connection's own MCP server (`<environment URL>/mcp/v3/connections/<connection name>`), which serves all of that connection's tools without an MCP configuration. Pass `connectionName` instead of `mcpConfigId`; if both are set, `mcpConfigId` is used. Existing `mcpConfigId` calls are unchanged. For either target, `accessLevel: 'READ_ONLY'` limits the token to read-only tools. The URL path is case-sensitive, so connect with the connection's name exactly as stored. [Reference](https://github.com/scalekit-inc/scalekit-sdk-node/blob/main/REFERENCE.md#virtual-mcp-servers)
+
+  ```ts
+  const session = await scalekit.actions.mcp.createSessionToken({
+    connectionName: 'gmail',
+    identifier: 'user_123',
+    expirySeconds: 900,
+    accessLevel: 'READ_ONLY',
+  });
+  const headers = { Authorization: `Bearer ${session.token}` };
+  ```
+time: '2026-10-09T15:33:01.189094+00:00'
+custom:
+  Breaking: 'No'
+  Ticket: SK-2195
+  Migration: ''

.prettierignore

@@ -7,4 +7,7 @@ CLAUDE.md
 jest.config.js
 README.md
 REFERENCE.md
-src/pkg/grpc/
+src/pkg/grpc/
+# Release notes: generated by release tooling
+CHANGELOG.md
+.changes/