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C ABI: full example suite + docs & About coverage (#224)

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Stacked on #222 (base `feat/c-abi-hub`), so the diff is just the additions on top of the hub foundation — no merge of #222 required.

## What this adds

**Examples — full parity with rust/python/node (`examples/c/`)**
- `streaming.c` upgraded to the multi-indicator (SMA/EMA/RSI/MACD + signals) demo
- `backtest.c`, `multi_timeframe.c` (manual time-bucket resampling), `parallel_assets.c` (serial vs OpenMP fan-out, one handle per asset)
- three educational strategies: `strategy_rsi_mean_reversion.c`, `strategy_macd_adx.c`, `strategy_bollinger_squeeze.c`
- two network examples shelling out to `curl`: `fetch_btcusdt.c`, `live_binance.c` (REST poll)
- two header-only helpers (`wickra_csv.h`, `wickra_strategy.h`) since the C ABI ships no IO layer
- CMake builds all 11; the 9 offline ones run under `ctest` on 3 OS; the network two are built-only

**Docs & metadata — surface the C ABI everywhere it was missing**
- ARCHITECTURE diagram + crate table, SECURITY + THREAT_MODEL (the C ABI as the sole `unsafe` FFI surface), the three binding package READMEs, issue/PR templates, CHANGELOG, and the GitHub About template (live About + org description updated too)

**Cleanup**
- removed all references to the private generator tooling from public files (`bindings/c/src/lib.rs` header, `CONTRIBUTING.md`, `sync-about.yml`)

Verified locally: `cargo build -p wickra-c --release`, `cmake + ctest` (9/9 pass), and `-Wall -Wextra -Wpedantic` clean on gcc 13.
This commit is contained in:
kingchenc
2026-06-09 02:14:28 +02:00
committed by GitHub
parent 91e05e3c26
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@@ -50,6 +50,28 @@ Expected output:
OK: wickra C ABI smoke passed (SMA streaming + batch + reset + NULL-safety + free)
```
## The examples
| Example | What it does |
|---------|--------------|
| `smoke.c` | Links the boundary and asserts SMA streaming / batch / reset / NULL-safety values. |
| `streaming.c` | Feeds a synthetic price series through SMA / EMA / RSI / MACD tick by tick. |
| `backtest.c` | Runs an indicator basket over an OHLCV CSV (defaults to the bundled daily dataset). |
| `multi_timeframe.c` | Resamples the bundled 1-minute CSV to 5m / 15m / 1h / 4h / 1d and prints indicators per timeframe. |
| `parallel_assets.c` | Serial vs OpenMP fan-out over a synthetic panel (one handle per asset), with speedup. |
| `strategy_rsi_mean_reversion.c` | Hourly RSI(14) mean-reversion with a PnL / Sharpe / max-drawdown summary. |
| `strategy_macd_adx.c` | Hourly MACD crossover gated by ADX(14) > 20. |
| `strategy_bollinger_squeeze.c` | Daily Bollinger-squeeze breakout with an ATR(14) stop. |
| `fetch_btcusdt.c` | Downloads BTCUSDT klines from the Binance REST API into `examples/data/` (shells out to `curl`). |
| `live_binance.c` | Polls the Binance REST klines endpoint via `curl` and streams closed candles through RSI(14). |
| `smoke.cpp` | C++ RAII via `wickra::Handle` from [`wickra.hpp`](../../bindings/c/include/wickra.hpp). |
`ctest` builds and runs every example except `fetch_btcusdt` and `live_binance`,
which reach the network and are built only — run those two by hand. The C ABI
exposes only the indicators, not the `wickra-data` IO layer, so the examples read
CSV ([`wickra_csv.h`](wickra_csv.h)) and resample themselves; the network ones
shell out to the system `curl` rather than adding an HTTP/TLS dependency.
## Usage shape
Every indicator follows the same five-function pattern over an opaque handle: