# Apply Report: Track 6 Slice 1 — Bridge Contract, Auth, and Admission

## Change

- **Change ID:** `2026-04-26-track-6-slice-1-bridge-contract-auth`
- **Scope:** First delivered Track 6 remote-session slice covering versioned bridge contract, JWT-backed admission/authentication, session-scope binding, and bounded transport negotiation, while preserving local fail-closed rejection of `remote_bridge` under Track 4 orchestration.

## Outcome

Apply work for this change had already been completed in the runtime and spec tree. This step persists the missing apply artifacts needed to complete the OpenSpec audit chain.

The implemented slice delivers:

- a dedicated `bridge-remote-sessions` source-of-truth domain for Track 6;
- a versioned remote bridge admission contract built on shared bridge types;
- JWT-backed admission validation and subject/session-scope binding;
- bounded acceptance semantics for supported bridge requests;
- continued fail-closed local rejection of `remote_bridge` through Track 4 launch paths.

## Implementation Summary

Implementation and testing were already complete before this documentation catch-up step. Based on the proposal, design, checked tasks, focused verification evidence, and current bridge runtime tests, the completed apply work covered these primary surfaces:

- `clients/agent-runtime/src/bridge/mod.rs`
  - defines shared bridge admission contract/types;
  - validates protocol version, transport, JWT presence/shape, and session scope;
  - binds admitted sessions to caller subject and authorized session scope;
  - rejects malformed, missing, or unauthorized admission attempts fail-closed.
- `clients/agent-runtime/src/tools/delegate_launch.rs`
  - preserves local Track 4 behavior by rejecting `remote_bridge` requests with stable deferred/fail-closed semantics rather than silently admitting weaker behavior.
- `openspec/changes/2026-04-26-track-6-slice-1-bridge-contract-auth/specs/bridge-remote-sessions/spec.md`
  - establishes the dedicated Track 6 spec domain and bounded first slice contract.

## Verification Evidence

The following focused verification command was run successfully against the delivered bridge/auth slice:

```bash
cargo test --manifest-path clients/agent-runtime/Cargo.toml bridge -- --nocapture
```

Observed result:

- focused bridge-related runtime tests passed;
- output included successful coverage for valid JWT-backed admission, rejection of missing/malformed JWTs, rejection of unauthorized scope binding, session-scope binding on admitted sessions, and continued local fail-closed handling of `remote_bridge` through launch tooling.

## Task State

`tasks.md` for this change is checked complete.

## Audit Completion

This report, together with `apply-result.json` and `state.yaml`, closes the missing apply-artifact gap for this change so the OpenSpec audit chain is complete.
