M2: CLI create/claim/complete via GitHub

[signalreason]

Status: queued
Schema: AIP-0.1

version: "0.1"
status: queued
owner: null
goal: "Add CLI commands to create, claim, and complete AIP issues using GitHub."
acceptance_criteria:
  - "CLI can create an issue from a template file."
  - "CLI can claim an issue (status + lease + label updates)."
  - "CLI can complete an issue (status -> review/done)."
  - "All commands support GitHub auth via gh or token."
acceptance_tests:
  - "Create a test issue, claim it, and move it to review using the CLI."
inputs:
  - "schema/issue.schema.json"
outputs:
  - "CLI commands for create/claim/complete"
dependencies:
  - issue: "#2"
    note: "Validation CLI baseline"
risks:
  - "GitHub API rate limits or auth friction."
constraints:
  - "No paid services or hosted infra."
non_goals:
  - "No web UI."
lease:
  claimed_by: null
  claimed_at: null
  expires_at: null
metadata:
  created_by: ""
  created_at: ""
  updated_at: ""
notes: ""