release: bump 0.9.5 -> 0.9.6 (#331)

Documentation release for the R binding. The library API and every indicator are
unchanged from `0.9.5`; only the R package's help pages change.

### What's in 0.9.6
- **R package documentation** (landed in #330): the twelve undocumented data-layer
  exports now have full man pages, the stale `AwesomeOscillatorHistogram` codoc is
  fixed, and a broken `push()` example is corrected — clearing the two `R CMD check`
  warnings r-universe reported for `0.9.5`. CI now runs `R CMD check` so doc drift
  fails the PR instead of reaching r-universe.

Pure version-string bump on top — `bump_version.py` touched 19 files. `cargo fmt`
clean.

Tag/publish waits for explicit GO (irreversible publish to crates.io / PyPI / npm
/ NuGet / Maven / Go / r-universe).

bindings/node/npm/linux-arm64-gnu/package.json

@@ -1,6 +1,6 @@
 {
   "name": "wickra-linux-arm64-gnu",
-  "version": "0.9.5",
+  "version": "0.9.6",
   "description": "Native binding for wickra (linux arm64 GNU). Installed automatically as an optional dependency of wickra on matching platforms.",
   "main": "wickra.linux-arm64-gnu.node",
   "files": [