feat: add generated scene skill platform hardening

docs/superpowers/specs/2026-04-19-bootstrap-target-normalization-roadmap-design.md

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+# Bootstrap Target Normalization Roadmap Design
+
+> Date: 2026-04-19
+> Parent Sequence: `2026-04-19-final-2-residual-child-plan-sequence-plan.md`
+> Fixed Scene: `sweep-091-scene`
+
+## Intent
+
+Normalize the remaining `page_state_eval` bootstrap target residual without opening general login recovery or browser navigation runtime.
+
+## Fixed Scope
+
+Only `sweep-091-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 bootstrap target reason.
+
+## Forbidden Scope
+
+1. no general login recovery
+2. no full browser navigation runtime
+3. no host-bridge runtime work
+4. no new family