# Channel contract

A channel translates an external invocation into profile-driven gateway input;
it does not select a rein class or execute a provider itself.

```python
@dataclass
class GatewayInvocation:
    harness_profile: str
    repo: str
    title: str
    description: str
    actor: str = "agt"
    project: str = "glas-harness"
    report_to_hub: bool = True
```

`CLIChannel` is the current implementation. The CLI requires
`--harness-profile <id[@version]>`; the old sandbox-only input is removed
because it could not identify the rein, model route, tool policy, or contract
revision. Channels may obtain a profile choice from their own approved
configuration, but must pass it explicitly and must surface resolution refusal
to their caller.

Channels pass `actor` as a governed sandbox consumer type: `adm`, `agt`, or
`atm`. A queue's concrete `worker_id` is not an actor and remains upstream
ownership metadata. For example, a worker named `rein-aharness@railiance01`
invoking ordinary governed agent work passes `actor="agt"`; it does not copy
its worker id into the actor field.

The channel renders the full direct `GatewayResult`. State Hub receives only
the compact `ExecutionEvidence` subset.

## Adding a channel

Implement `parse_invocation` and `render_result`, then call `run_execution`
with an `ExecutionRequest`. Carry any assignment/role/duty/goal/resource
references supplied by the upstream workforce system. Do not duplicate profile
resolution, sandbox coordination, leadership decisions, or rein construction in
the channel.