claw/docs/superpowers/specs/2026-04-19-g6-host-bridge-execution-semantics-design.md

G6 Host-Bridge Execution Semantics Design

Date: 2026-04-19 Status: Draft Upstream Report: 2026-04-19-g6-host-bridge-prerequisites-report.md

1. Intent

This design defines the next bounded slice after G6 host-bridge prerequisites isolates the minimum blocked capability.

The target is:

G6 host-bridge execution semantics

2. Why This Slice

This slice is selected because the remaining G6 gap is narrower than broad host-runtime implementation:

1. bridge action invocation semantics
2. callback completion semantics

3. Scope Boundary

This design is limited to semantic scoping only.

It may include:

1. defining the minimum bridge action semantic
2. defining the minimum callback completion semantic
3. defining how those semantics bound later G6 real-sample entry

It must not include:

1. implementing host-runtime directly
2. executing a G6 real sample
3. opening G8
4. reopening G7

4. Target Outcome

The bounded target outcome is one state:

1. one bounded G6 host-bridge execution semantics plan

5. Exit Condition

This design is complete when implementation can be bounded to one plan that:

1. freezes the semantic boundary
2. separates bridge invocation from callback completion
3. emits one bounded follow-up plan