feat: add generated scene skill platform hardening

docs/superpowers/reports/2026-04-19-g6-host-bridge-execution-semantics-report.md

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+# G6 Host-Bridge Execution Semantics Report
+
+> Date: 2026-04-19
+> Plan: [2026-04-19-g6-host-bridge-execution-semantics-plan.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/plans/2026-04-19-g6-host-bridge-execution-semantics-plan.md)
+
+## Result
+
+This bounded slice separates the `G6` blocked capability into two explicit semantics:
+
+1. `host-bridge-action-invocation`
+2. `callback-request-completion`
+
+## What Was Isolated
+
+The existing generated `G6` runtime shape already exposes two semantic seams:
+
+1. `invokeHostBridge`
+2. `callbackEndpoints` and callback result accumulation
+
+So this slice does not treat `G6` as a broad runtime-platform gap anymore.
+
+It treats `G6` as a bounded semantic modeling problem.
+
+## Explicit Non-Goal
+
+This slice does not broaden into:
+
+1. host-runtime transport rebuild
+2. `G6` real-sample execution
+3. `G8` work
+
+## Follow-Up
+
+The next bounded step is:
+
+1. `G6 host-bridge callback semantics`