feat: full counter_id directory + public counter module

CHANGELOG.md

@@ -9,6 +9,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - **All languages:** `FundamentalContext` gains `etf_asset_allocation(symbol)` — queries `GET /v1/quote/etf-asset-allocation` for ETF asset allocation grouped by element type (`Holdings` / `Regional` / `AssetClass` / `Industry`); returns `AssetAllocationResponse` with report date, position ratios, localized names, and per-holding detail
+- **Rust:** new public `longbridge::counter` module — `symbol_to_counter_id`, `index_symbol_to_counter_id`, `counter_id_to_symbol`, and `is_etf`, backed by the embedded ETF + index + warrant directory, so downstream consumers (CLI / MCP) no longer need their own copies
+
+### Changed
+
+- `symbol_to_counter_id` now also consults the embedded index and warrant directories — e.g. `HSI.HK` → `IX/HK/HSI`, `10005.HK` → `WT/HK/10005`; leading zeros are stripped from numeric `.HK` codes (`00700.HK` → `ST/HK/700`, A-share codes are kept verbatim)
+
+### Fixed
+
+- Refreshed the embedded US ETF list (4574 → 7250 entries, from the instrument-management export) and added index (648) + warrant (17693) directories — newer ETFs (e.g. `DRAM.US`) were resolved to `ST/...` instead of `ETF/...` counter IDs, breaking ETF-specific APIs such as `etf_asset_allocation`
 
 ## [4.2.2]
 

rust/src/lib.rs

@@ -16,6 +16,8 @@ mod serde_utils;
 mod types;
 mod utils;
 
+pub use utils::counter;
+
 #[cfg(feature = "blocking")]
 #[cfg_attr(docsrs, doc(cfg(feature = "blocking")))]
 pub mod blocking;