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

G6 Host-Bridge Execution Semantics Plan

Date: 2026-04-19 Status: Draft Upstream Spec: 2026-04-19-g6-host-bridge-execution-semantics-design.md

Plan Intent

This plan executes one bounded next slice:

G6 host-bridge execution 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 the semantic boundary
2. WS2 Separate bridge invocation from callback completion
3. WS3 Publish one bounded semantic result

Phase 0: Freeze the Boundary

Objective

Lock the plan to semantic scoping only.

Tasks

1. freeze G6 as the only target
2. freeze real execution and implementation as out of scope

Acceptance Criteria

1. no host-runtime implementation begins under this plan

Phase 1: Separate the Minimum Semantics

Objective

Turn the blocked capability into explicit bounded semantics.

Tasks

1. isolate bridge action invocation semantics
2. isolate callback completion semantics
3. keep both separate from broader host-runtime work

Acceptance Criteria

1. the semantic model is explicit and bounded

Phase 2: Publish the Bounded Result

Objective

Turn the 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