Agent Plugins 0.9.0

• Align installation guidance on AEP 0.55.0 and ESS 0.20.0, both with published native
  archives. Keep ESS 0.22.0 out of the download instructions while its archives are unavailable.
• Use Metaharness 0.7.0 for governed model runs through metaharness aep drive. Supply the
  separate planning executable with --aep-binary, preserve plugin and budget inputs, and
  require the explicit METAHARNESS_LIVE=1 opt-in.
• Bring the planning skill's command inventory up to AEP 0.55.0, including waves, findings,
  review-value, set and scope. Explain conformance report ingestion through
  evidence --from, report/2 suite binding, model digests and specification lifecycle states.
• Document ESS conformance synthesis, execution and evidence ingestion. Distinguish the pinned
  ESS 0.20.0 system-file layout from ess-inputs.yaml, introduced in 0.21.0.
• Update example crate paths for AEP's area-based layout and keep both plugin manifests and
  current installation pins aligned at 0.9.0.
• Publish source through standalone bot tooling without an Atlas checkout or organization
  admission requirement. Repository correctness and release checks remain repository-owned.

Historical walkthrough and paid-evaluation pins remain attached to their original recordings.
This source release was cut without running gates, tests, live evaluations or binary packaging,
at the operator's request. Earlier preparation evidence remains in the planning record.