Harvest sweep, batch 2 of 6.
- exec's file-target classification is now a four-way shape peek
(campaign / blueprint / op-script / wrong-kind): a valid-JSON op-script
array refuses at the routing seam with a build-first pointer ('aura
graph build') instead of the blueprint leg's false 'not valid JSON'
claim, and a kind-bearing non-campaign document names the found kind
plus exec's two executable classes. Exit-code classes unchanged
(op-script usage-class 2, wrong-kind runtime-class 1).
- the bare-tap measurement leg renders CompileError::UnboundRootRole by
the signal's own root-role NAME (captured pre-consumption), retiring
the raw Debug-form leak; every other variant keeps the total fallback.
refs #342
refs #339
claude
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