Repair on edits

Schema-based tool-call repair runs on all tools, including edit, before argument validation. Hashline parsing and verification inside @veyyon/hashline is a separate step.

When a model emits a malformed edit (or compatibility apply_patch) call:

1. Schema repair attempts JSON recovery and ambiguity refusal at the agent-loop seam.
2. If repair succeeds, arguments proceed to hashline / apply_patch validation and dispatch.
3. If repair cannot disambiguate, the loop returns an error tool result with hints (no dispatch).
4. Hashline still applies envelope stripping and bare-body handling inside @veyyon/hashline.

See Repair overview and The hashline edit engine.