docs: open v0.1.1 backlog with SampleManifestEmitter relocation note

Defer until post-flip — build-helper-in-tests/ is fine for v0.1.0;
moving it now would be pre-flip churn.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: MacFall7

docs/v0.1.1_backlog.md

@@ -0,0 +1,7 @@
+# v0.1.1 Backlog
+
+Post-v0.1.0 cleanup items. Not for the v0.1.0 ship — pre-flip churn is the wrong tradeoff that close to a visibility flip.
+
+## Code organization
+
+- **Move `SampleManifestEmitter` from `tests/` to `tools/`** — it's a build helper, not a test, even though it's `#if`-guarded inert today. Logged 2026-04-30.