feat: add generated scene skill platform hardening

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

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+# G6 Host-Bridge Callback Semantics Report
+
+> Date: 2026-04-19
+> Plan: [2026-04-19-g6-host-bridge-callback-semantics-plan.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/plans/2026-04-19-g6-host-bridge-callback-semantics-plan.md)
+
+## Result
+
+This bounded slice defines four explicit callback completion states:
+
+1. `ok`
+2. `partial`
+3. `blocked`
+4. `error`
+
+## What Was Formalized
+
+The current generated `G6` runtime shape already encodes a state priority:
+
+1. `blocked`
+2. `error`
+3. `partial`
+4. `ok`
+
+This slice formalizes that priority instead of leaving it as implicit code behavior.
+
+## Explicit Non-Goal
+
+This slice does not broaden into:
+
+1. host-runtime implementation
+2. `G6` real-sample execution
+3. `G8` work
+
+## Follow-Up
+
+The next bounded step is:
+
+1. `G6 host-bridge callback state verification`