(MOT-3868) fix(harness): publish typed request schema for harness::react

[ytallo]

Summary

• Add a typed ReactEvent wire-schema wrapper for harness::react while preserving the lossless serde_json::Value runtime payload (same pattern as NotifyAgentEvent in harness::notify_agent).
• Register harness::react with that typed request shape so release interface collection no longer publishes AnyValue for its request schema.
• Add harness::react to the harness schema catalog and commit the new golden snapshot.

Root Cause

The harness release publish gate collected worker-interface.json successfully, then failed because harness::react.request_schema was the permissive AnyValue schema. The handler was registered with a raw serde_json::Value event payload even though the registry publish gate requires typed function request/response schemas.

Validation

• UPDATE_GOLDENS=1 cargo test --manifest-path harness/Cargo.toml --test schemas
• cargo test --manifest-path harness/Cargo.toml
• cargo clippy --manifest-path harness/Cargo.toml --all-targets -- -D warnings
• git diff --check

Fixes MOT-3868

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[github-actions]

skill-check — worker

0 verified, 32 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.

[ytallo]

Superseded by #405 (branch renamed; GitHub auto-closed this PR on rename).