feat(solana): add BisonFi DEX integration

[karimhass]

• Add BisonFi DEX models (stg_raw_swaps, base_trades, trades, schema)
• Uses optimized 3-step semi-join pattern for tokens_solana.transfers
• project_start_date 2026-02-03 with 1-day cap for CI efficiency
• Add bisonfi_solana_base_trades to dex_solana_base_trades union
• Fix contributor name: Eekeguy → Eekeyguy

Thank you for contributing to Spellbook 🪄

Please open the PR in draft and mark as ready when you want to request a review.

Description:

[...]

---

quick links for more information:

• README.md
• spellbook docs
• CONTRIBUTING.md

[cursor]

PR Summary

Medium Risk
Adds new incremental DEX trade extraction and joins against the large tokens_solana.transfers table, so correctness and performance of the semi-join/index arithmetic are the main risks; existing protocols are largely unaffected aside from the expanded union.

Overview
Adds a new BisonFi Solana DEX integration by introducing incremental dbt models to extract swap instructions from solana.instruction_calls and transform them into standardized base_trades rows.

The new base_trades model joins swaps to tokens_solana.transfers via a 3-step keyset + EXISTS semi-join pattern (with uniqueness enforced via surrogate_key) and exposes a bisonfi_solana_trades view filtered from dex_solana_trades, plus accompanying schema.yml tests/metadata. dex_solana_base_trades is updated to union in bisonfi_solana_base_trades.

^{Written by Cursor Bugbot for commit 9ea4ea1. Configure here.}