Agent Plugins 0.19.1

The ess skills now say where implementation code comes from: the specification, through
ess generate synthesize, and never a hand transcription. A hand-transcribed model passed a
669-scenario conformance suite with every entity field unchecked.

• ess:specifying gains "Implementation code comes from the specification": fill the generated
  …Behavior and …Query obligations, commit the generated tree, and fail the gate when a
  regeneration differs. When synthesize refuses a specification, file the refusal on
  beyond10x/ess; until the fix ships, a hand-written model needs a test that compares it with the
  compiled IR field by field.
• ess:testing-conformance: a green suite proves only the fields its expectations read, and a
  synthesized scenario witnesses one value per any_of guard.
• verified.json does not move: agentplugins-check tools still reports aep 0.65.0 and ess 0.43.0
  as newer than verified, and aep plan artifact divergences as not a command of aep 0.65.0. The
  commands the new sections spell pass against ess 0.43.0.