[AIAA] Build probe: first cloud-agent delegation (section 17 checks 1-5) #366

The spec's probe delegation (PR #363, section 16, as amended by
09a92bf): the first delegation to the cloud agent is a deliberately
disposable task whose real product is observed platform behavior. The
draft PR closes unmerged and links here; the answers are recorded below
against the spec's section 17 build-time checks and parameterize later
build steps.

Depends on: #364 (preflight gates every delegation to the cloud agent).

Observations to record (section 17 build-time checks)

Prior evidence from cncf/mentoring's cloud-agent PRs (#1527, #1631,
#1668, Dec 2025 to Feb 2026) sets expectations for the first three
items; the platform may have changed since, so each is recorded fresh
here.

• Agent branch naming (head ref of the draft PR). Expected:
  copilot/<kebab-slug>, three for three in cncf/mentoring.
  Recorded:
• Whether delegation reliably opens a draft pull request (first
  data point; confirmed again on every later delegation). Expected:
  yes; in cncf/mentoring the agent opened a PR even when blocked,
  using the body to ask for clarification.
  Recorded:
• The agent token's effective scopes, best effort (session logs and
  PR timeline: what the token demonstrably did or failed to do). If
  not directly observable, record that with the behavioral
  evidence. Prior evidence: mentoring #1631, asked to create
  issues, reported "the necessary tools are read-only". The probe
  prompt asks the agent to attempt a label write and report the
  result.
  Recorded:
• Whether Actions runs on the agent's PR wait for approval (Checks
  tab: do format-check, link-check, and spell-check run on their
  own or queue as "waiting for approval"?). No prior signal:
  mentoring's agent PRs triggered no Actions workflows.
  Recorded:
• What access review-comment revisions require (a writer requests a
  change; someone without write access comments; note which the
  agent acts on). Needs a volunteer without write access. No prior
  signal: every mentoring commenter held write.
  Recorded:

Spec references

Section 16 probe delegation (as amended by 09a92bf); checks from
section 17; bound by P-1 (a human delegates, reviews, and closes). The
draft PR closes unmerged, per section 16: the observations, not the
diff, are the product.