fix(changeset): use scoped package name for session lifecycle

Release workflow failed because the changeset referenced "codemap"
instead of "@stainless-code/codemap". Also patch (not minor) per
pre-v1 bump policy — no schema break.

Author: SutuSebastian

.changeset/mcp-session-lifecycle-hygiene.md

@@ -1,5 +1,5 @@
 ---
-"codemap": minor
+"@stainless-code/codemap": patch
 ---
 
 MCP session lifecycle hygiene: stdio disconnect detection (stdin EOF, stdout EPIPE, parent-PID poll) with graceful watcher shutdown on client exit; HTTP `serve --watch` refcount-gates the watcher per request (5s release grace, `/health` excluded). No MCP idle shutdown.