Acknowledge an issue — "I'm looking at this".
Needs only issues:read, deliberately: signalling that you have picked
something up must not require write authority. It does not change who is
accountable — POST /issues/{iid}/assign does that.
More than one person may ack, and each one lands an attributed row on the
activity log, but acknowledged_at / acknowledged_by keep recording the
FIRST ack, so a retry or a double-click cannot inflate time-to-acknowledge.
Acking also subscribes you to the thread.
Authorizations
A scoped AgentEye API key. Mint one in the dashboard under Settings → API keys, or with POST /v1/keys. Each endpoint names the permission it requires; a key without it gets 403 and a required_permission field naming what was missing.
Path Parameters
The issue's id.
Response
Acknowledged; returns the issue's state and acknowledged_at.

