Fix Tide Chart gTrade resolve-pair asset summary

[dive2tech]

Summary

This PR fixes the Tide Chart gTrade resolve-pair endpoint so it uses a supported SynthClient API and reliably returns the current asset price for the frontend.

Related Issues

#45

Type of Change

• Bug fix
• Improvement to existing tool
• Documentation
• Other (describe below)

Changes

• Added get_asset_summary(asset, horizon) to SynthClient to expose a small, typed snapshot including asset, horizon, and current_price, backed by get_prediction_percentiles.
• Updated /api/gtrade/resolve-pair in the Tide Chart server to call client.get_asset_summary(asset, horizon="24h") instead of a non-existent client method, and to always return a stable JSON shape with asset, pair_index, and current_price.
• Extended tests to cover:
  • The new get_asset_summary helper, including validation of asset and horizon inputs.
  • The Tide Chart /api/gtrade/resolve-pair route, asserting that current_price is present and numeric when mock Synth data is available.

Testing

• Unit tests for synth_client:
  • tests/test_synth_client.py::test_get_asset_summary_returns_current_price
  • tests/test_synth_client.py::test_get_asset_summary_rejects_unsupported_asset
  • tests/test_synth_client.py::test_get_asset_summary_rejects_unsupported_horizon
• Tide Chart tool tests:
  • tools/tide-chart/tests/test_tool.py::test_flask_gtrade_resolve_pair_valid
    Run:

pytest tests/test_synth_client.py
pytest tools/tide-chart/tests/test_tool.py