Dynamo integration Branch

CONTRIBUTING.md

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+# Contributing to fastokens
+
+Thank you for your interest in contributing. The notes below cover the development workflow and testing requirements.
+
+## Building
+
+```sh
+cargo build
+```
+
+To build without the optional `pcre2` C dependency (pure-Rust build):
+
+```sh
+cargo build --no-default-features
+```
+
+## Testing
+Run the test suite to catch regressions:
+
+```sh
+# Default build — pcre2 JIT fast path enabled
+cargo test
+
+# Pure-Rust build — fancy-regex fallback, no libpcre2-8 required
+cargo test --no-default-features
+```
+
+## Code style
+
+After making any changes to Rust source files, run the formatter before committing:
+
+```sh
+cargo fmt
+```
+
+## Feature flags
+
+| Feature | Default | Notes |
+|---------|---------|-------|
+| `pcre2` | on | Links to `libpcre2-8` via `pcre2-sys`. Disable with `--no-default-features` if the system library is unavailable. |