feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-19-host-bridge-runtime-roadmap-design.md

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+# Host-Bridge Runtime Roadmap Design
+
+> Date: 2026-04-19
+> Parent Sequence: `2026-04-19-final-2-residual-child-plan-sequence-plan.md`
+> Fixed Scene: `sweep-085-scene`
+
+## Intent
+
+Close or narrow the remaining host-bridge runtime residual without resurrecting the old G6 semantics micro-plan chain.
+
+## Fixed Scope
+
+Only `sweep-085-scene` is in scope.
+
+## Minimal Success Definition
+
+The scene must either:
+
+1. become `framework-auto-pass-candidate`; or
+2. remain `framework-structured-fail-closed` with a narrower named host-bridge runtime hold.
+
+## Forbidden Scope
+
+1. no general host-runtime transport implementation
+2. no new G6 semantics micro-plan
+3. no changes to G1-E/G2/G3 routes
+4. no new family