rdar 0.5.19

Installer and launcher for radar, the fast local repository router
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# rdar

`rdar` installs the `radar` command, a fast local repository router written in
Rust. This small, auditable launcher downloads a stripped GitHub release,
verifies its SHA-256 checksum, caches it per native version and platform, then
forwards arguments.

Launcher release 0.5.19 installs pinned radar 0.5.19 artifacts for the native
targets that are published and checksummed on GitHub:

| Native target | Release asset | Launcher status |
|---|---|---|
| `linux-x86_64` | `radar-v0.5.19-linux-x86_64.tar.gz` | enabled |
| `linux-aarch64` | `radar-v0.5.19-linux-aarch64.tar.gz` | enabled |
| `macos-x86_64` | `radar-v0.5.19-macos-x86_64.tar.gz` | enabled |
| `macos-aarch64` | `radar-v0.5.19-macos-aarch64.tar.gz` | enabled |
| `windows-x86_64` | `radar-v0.5.19-windows-x86_64.zip` | enabled |
| `windows-aarch64` | `radar-v0.5.19-windows-aarch64.zip` | enabled |

Apple Silicon is the `macos-aarch64` target. Windows ARM64 is
`windows-aarch64`. The 0.5.19 compressed release archives are 3.55 to
3.88 MiB; the unpacked binaries are 26.34 to 27.62 MiB. Linux musl
artifacts are statically linked and stripped; macOS artifacts are
Mach-O `DYLDLINK` binaries and are not advertised as static.

```bash
cargo install --locked rdar
radar --version
cd your-project
radar map
radar query "where is the auth boundary?" --source
```

## Measured results

- Live navigation input: 15,407 to 4,249 tokens, 72.4% lower.
- Live reference cost: $0.1555 to $0.0564, 63.7% lower.
- Accuracy: 20/21 to 21/21 in the locked live navigation matrix.
- Retrieval: expected source anchor in the top three for 40/40 questions.
- Generated 10,000-file query: 28.74 ms p95 with zero model calls.

Radar combines deterministic tree-sitter extraction, compact lexical
fingerprints, exact-symbol routing, confidence-based abstention, bounded
source-span verification, incremental content-addressed caches, and tiny
committed `MAP.md` routers. Maps and caches are derived navigation data; source
files remain authoritative.

Methods and installable release artifacts are published at
[radar.sanixdk.xyz](https://radar.sanixdk.xyz) and
[GitHub Releases](https://github.com/Sanix-Darker/radar/releases).