feat: add generated scene skill platform hardening

docs/superpowers/plans/2026-04-19-g6-host-bridge-callback-semantics-plan.md

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+# G6 Host-Bridge Callback Semantics Plan
+
+> Date: 2026-04-19
+> Status: Draft
+> Upstream Spec: [2026-04-19-g6-host-bridge-callback-semantics-design.md](D:/data/ideaSpace/rust/sgClaw/claw-new/docs/superpowers/specs/2026-04-19-g6-host-bridge-callback-semantics-design.md)
+
+## Plan Intent
+
+This plan executes one bounded next slice:
+
+`G6 host-bridge callback semantics`
+
+## Scope Guardrails
+
+1. do not execute a `G6` real sample
+2. do not implement host-runtime directly
+3. do not open `G8`
+4. do not reopen `G7`
+5. do not open `G4 / G5`
+
+## Workstreams
+
+1. `WS1` Freeze callback semantics scope
+2. `WS2` Define completion-state semantics
+3. `WS3` Publish one bounded callback-semantic result
+
+## Phase 0: Freeze the Boundary
+
+### Objective
+
+Lock the plan to callback semantics only.
+
+### Tasks
+
+1. freeze `G6` as the only target
+2. freeze transport/runtime implementation and real execution as out of scope
+
+### Acceptance Criteria
+
+1. no broader host-runtime work begins under this plan
+
+## Phase 1: Define Completion-State Semantics
+
+### Objective
+
+Turn callback completion into an explicit bounded semantic model.
+
+### Tasks
+
+1. define `ok`
+2. define `partial`
+3. define `blocked`
+4. define `error`
+
+### Acceptance Criteria
+
+1. callback state logic is explicit and bounded
+
+## Phase 2: Publish the Bounded Result
+
+### Objective
+
+Turn the callback-semantic model into one bounded next artifact.
+
+### Tasks
+
+1. publish the semantic result
+2. if needed, publish the next bounded follow-up plan
+
+### Acceptance Criteria
+
+1. the next step remains narrower than direct host-runtime implementation