feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-post-g7-boundary-decision-report.md

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+# Post-G7 Boundary Decision Report
+
+> Date: 2026-04-19
+> Roadmap: [2026-04-19-post-g7-boundary-decision-roadmap-plan.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/plans/2026-04-19-post-g7-boundary-decision-roadmap-plan.md)
+
+## Decision
+
+One bounded next direction is selected:
+
+1. `prerequisites-only hold`
+
+The following boundary families remain held:
+
+1. `G6`
+2. `G8`
+
+## Comparison Result
+
+### G6
+
+`G6` still needs stronger host-bridge real execution semantics than the current bounded next-step budget allows.
+
+So `G6` remains held.
+
+### G8
+
+`G8` still needs local document runtime and attachment handling beyond current repo-local coverage.
+
+So `G8` remains held.
+
+### Prerequisites-Only Hold
+
+After `G7` has already closed as an executed boundary-family sample, the safest bounded next step is no longer another direct family-entry attempt.
+
+The smaller next direction is to scope the remaining prerequisites first.
+
+So `prerequisites-only hold` is selected.
+
+## Result
+
+The roadmap now has one bounded next direction:
+
+1. `boundary runtime prerequisites roadmap`
+
+This report does not implement any prerequisite.
+
+It only closes the post-`G7` boundary ambiguity.