feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-19-g6-host-bridge-entry-gate-design.md

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+# G6 Host-Bridge Entry Gate Design
+
+> Date: 2026-04-19
+> Status: Draft
+> Upstream Report: [2026-04-19-g6-host-bridge-entry-readiness-report.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/reports/2026-04-19-g6-host-bridge-entry-readiness-report.md)
+
+## 1. Intent
+
+This design defines the next bounded slice after `G6 host-bridge entry readiness`.
+
+The target is:
+
+`G6 host-bridge entry gate`
+
+## 2. Why This Slice
+
+The semantic readiness criteria are now explicit.
+
+The next bounded pressure is:
+
+1. turn those criteria into a bounded future entry gate without opening real execution
+
+## 3. Scope Boundary
+
+This design is limited to gate modeling only.
+
+It may include:
+
+1. defining pass/fail gate conditions for a future `G6` entry slice
+2. defining which readiness criteria are hard blockers
+3. defining how the gate narrows later real-sample entry
+
+It must not include:
+
+1. executing a `G6` real sample
+2. implementing host-runtime directly
+3. opening `G8`
+4. reopening `G7`
+
+## 4. Target Outcome
+
+The bounded target outcome is one state:
+
+1. one bounded `G6 host-bridge entry gate` plan
+
+## 5. Exit Condition
+
+This design is complete when implementation can be bounded to one plan that:
+
+1. freezes gate-model scope
+2. defines bounded gate conditions
+3. emits one bounded follow-up plan