chore(scheduler): simulate dead-code-agent weekly execution

This commits the successful weekly agent scheduler run artifacts. The scheduler
successfully parsed its context, picked the `dead-code-agent` from the roster,
simulated execution which successfully cleaned up `create_simulated_artifacts.js`,
passed memory validation and repository test checks, published its completion,
and recorded its final `_completed.md` task log.

Co-authored-by: PR0M3TH3AN <[email protected]>

src/decisions/dead-code-agent.md

@@ -0,0 +1,5 @@
+# Decision
+Remove `create_simulated_artifacts.js`.
+
+# Rationale
+It is an orphaned manually executed script, not referenced anywhere in the repository, and removing it does not break the test suite.