claw/docs/superpowers/reports/2026-04-18-g6-host-bridge-first-slice-report.md

G6 Host Bridge First Slice Report

Date: 2026-04-18 Scope: G6 classification and fail-closed safety slice

Summary

The first G6 implementation slice is complete.

This round did not attempt runnable host bridge execution. It implemented the safer first step:

1. new host_bridge_workflow archetype
2. deterministic host bridge action detection
3. G6 classification priority over G1-E
4. G6 readiness gates
5. fail-closed generation behavior
6. regression protection so ordinary localhost export noise does not become G6

Assets Updated

1. src/generated_scene/ir.rs
2. src/generated_scene/analyzer.rs
3. src/generated_scene/generator.rs
4. tests/fixtures/generated_scene/g6_host_bridge_workflow/index.html
5. tests/scene_generator_test.rs

Behavioral Result

The new representative fixture validates:

1. workflowArchetype = host_bridge_workflow
2. host bridge action evidence includes sgBrowerserJsAjax2
3. host runtime evidence includes localhost:13313
4. business callbacks include getWorkOrderToDoList
5. business callbacks include queryMeterPlanFormulateApp
6. generation fails closed with host_bridge_workflow

Boundary Correction

The implementation initially exposed one boundary risk: plain localhost:* noise could promote a scene to G6.

The classifier was corrected so G6 requires explicit host bridge action evidence. localhost:* alone remains host-runtime evidence and does not define the archetype.

Validation

Executed:

cargo test --test scene_generator_test -- --nocapture
cargo test --test scene_generator_p1_family_test -- --nocapture
cargo test --test scene_generator_family_policy_test -- --nocapture
cargo test --test scene_generator_canonical_test -- --nocapture

All target regressions passed.

Result

G6 is now safely separated from G1/G1-E at classification time.

The family is intentionally still fail-closed until a real host bridge runtime contract is designed and implemented.