v0.5.0 — replace outputFormat dial with verbose flag + rename parsed→json

Breaking change to /run. v0.4.0's outputFormat enum conflated LLM
output style with response richness; v0.5.0 splits them into two
orthogonal request flags:

  jsonSchema (dict|null) → agent runs in JSON mode, response carries
                           json field. 3-retry self-correction on
                           parse/schema failure.
  verbose    (bool)      → response includes events + sessionId + usage
                           alongside text.

jsonSchema + verbose=true composes — verbose surface plus json (or
parseError + jsonRetries on failure).

Field rename: parsed → json. SDK regen recommended.