release: bump 0.8.2 -> 0.8.3 (#249)

Version bump 0.8.2 → 0.8.3, releasing the per-binding throughput benchmark work
(merged in #246).

Bumped via `ScriptHelpers/bump_version.py` across all manual touchpoints —
`Cargo.toml`, `pyproject.toml`, the Node `package.json` + 6 platform packages +
both lockfiles, the Java `pom.xml`s + README, the C# `.csproj`, the R
`DESCRIPTION` — plus `Cargo.lock` (via `cargo build`) and the `CHANGELOG.md`
`[0.8.3]` section and compare URLs.

CHANGELOG `[0.8.3]`:
- Per-binding throughput benchmarks for all 9 targets (BENCHMARKS.md §3).
- C ABI archetype test (`examples/c/archetypes.c`).

`cargo fmt`, `cargo test --workspace --all-features` (all green) and
`cargo clippy --workspace --all-targets --all-features -D warnings` pass. The
docs/webpage version strings are bumped by `sync-about.yml` on the `v*` tag —
not touched here.

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to Wickra are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.8.3] - 2026-06-10
 ### Added
 - **Per-binding throughput benchmarks** — every target now ships a `throughput`
   benchmark mirroring the Node `throughput.js`: streaming and batch
@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   each binding's FFI overhead — the same Rust core runs underneath all of them —
   and are documented in [BENCHMARKS.md](BENCHMARKS.md) §3, not a cross-library
   speed claim.
+- **C ABI archetype test** — `examples/c/archetypes.c` exercises one indicator
+  per FFI archetype (scalar, multi-output, bars, profile, array input) through
+  the C boundary, matching the Go/R/Java suites.
 
 ## [0.8.2] - 2026-06-10
 ### Fixed
@@ -1508,7 +1511,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   optional Binance live feed.
 - Bindings for Python, Node.js, and WebAssembly.
 
-[Unreleased]: https://github.com/wickra-lib/wickra/compare/v0.8.2...HEAD
+[Unreleased]: https://github.com/wickra-lib/wickra/compare/v0.8.3...HEAD
+[0.8.3]: https://github.com/wickra-lib/wickra/compare/v0.8.2...v0.8.3
 [0.8.2]: https://github.com/wickra-lib/wickra/compare/v0.8.1...v0.8.2
 [0.8.1]: https://github.com/wickra-lib/wickra/compare/v0.8.0...v0.8.1
 [0.8.0]: https://github.com/wickra-lib/wickra/compare/v0.7.9...v0.8.0