feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-boundary-runtime-prerequisites-decision-report.md

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+# Boundary Runtime Prerequisites Decision Report
+
+> Date: 2026-04-19
+> Roadmap: [2026-04-19-boundary-runtime-prerequisites-roadmap-plan.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/plans/2026-04-19-boundary-runtime-prerequisites-roadmap-plan.md)
+
+## Decision
+
+One bounded prerequisite direction is selected:
+
+1. `G6 host-bridge prerequisites`
+
+The following prerequisite direction remains held:
+
+1. `G8 local-doc prerequisites`
+
+## Comparison Result
+
+### G6 Host-Bridge Prerequisites
+
+`G6` is blocked by one clearer prerequisite line:
+
+1. host bridge real-sample execution semantics
+
+That is still platform-shaped, but it is narrower than the combined local-doc burden on `G8`.
+
+So `G6 host-bridge prerequisites` is selected.
+
+### G8 Local-Doc Prerequisites
+
+`G8` is blocked by a broader prerequisite bundle:
+
+1. local document runtime
+2. attachment handling
+
+That bundle is heavier than the next bounded slice should absorb.
+
+So `G8 local-doc prerequisites` remains held.
+
+## Result
+
+The roadmap now has one bounded next direction:
+
+1. `G6 host-bridge prerequisites`
+
+This report does not implement the prerequisite.
+
+It only closes the prerequisite priority ambiguity.