feat(jvchat): replay debug ticks with first-tick tool schemas

[Tharickv75]

Summary

• Record full tool schemas on the first observability tick of each unique tool surface so Debug Interactions can replay the request without storing the same payload on every tick.
• Extract replay snapshot helpers and unwrap success.data from the interact API so retest uses temperature, max_tokens, and the real result payload.

Test plan

• Open jvchat Debug Interactions, retest a tick that used tools, and confirm the replay includes tool schemas.
• Retest a later tick of the same tool surface and confirm it still replays (names + first-tick schemas).
• Run tests/action/model/test_observability_tool_definitions.py and jvchat/src/lib/debugReplay.test.ts.

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