feat(server): pre-adapter validation against legacy schema (stage 4b2)#671
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When the buyer claims a legacy version that routes through the adapter path, validate the input against the buyer's claimed schema *before* the adapter runs. Legacy field paths surface in errors — easier to act on than v3 paths after translation. Flow when wire_version in LEGACY_ADAPTER_VERSIONS: 1. Lookup adapter; INVALID_REQUEST if missing. 2. (new) Validate params against the legacy schema: - strict: raise VALIDATION_ERROR with claimed_version in details - warn: log the violation and let the adapter try - off / no config: skip (zero-overhead path preserved) 3. Run adapter.adapt_request(params). 4. Post-adapter validation against the SDK pin (existing). Stage 4b1 bundled v2.5 schemas; this wires them into the dispatch path. Full versioned-schema-validation port complete. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Stage 4b2 — wires bundled v2.5 schemas (#670) into dispatcher pre-adapter validation. Legacy field paths surface in validation errors before adapter runs. 5 new tests; 4524 passed.