§7.6: document the subscriber authority descriptor (lease_constraints, budget)

[nficano]

Documents the non-secret authority descriptor an observer receives on
job.subscribed, aligning the spec with the SDK schemas (which already declare
these fields):

• lease_constraints (expiry) — already sent by the TS runtime; now documented.
• budget — current per-currency counters; lets an observer render a live
  budget gauge (cap from the lease's cost.budget pattern + cost.budget.remaining metrics).
• Reaffirms that credentials follow the submitter only and are redacted
  for other observers (§14).

These bounds follow the observing principal, not the submitter — the
distinction that lets dashboards show expiry/budget for jobs they observe
without exposing secrets.

Implemented in agentruntimecontrolprotocol/typescript-sdk#149; tracked for the
other SDKs.

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Reviewing files that changed from the base of the PR and between a2ab76e and dd56ab8.

📒 Files selected for processing (1)

• docs/draft-arcp-1.1.md

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• Create PR with unit tests
• Commit unit tests in branch feat/subscribe-authority-descriptor

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