rdar 0.5.21

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 pinned release artifact, verifies
its SHA-256 checksum, caches it per native version and platform, then forwards
arguments.

By default it downloads from the public Radar website first:

- `https://radar.sanixdk.xyz/downloads`

If that source is unavailable, it falls back to the GitHub release:

- `https://github.com/Sanix-Darker/radar/releases/download/v0.5.20`

Launcher release 0.5.21 installs pinned radar 0.5.20 artifacts for the native
targets that are published and checksummed on GitHub:

| Native target | Release asset | Launcher status |
|---|---|---|
| `linux-x86_64` | `radar-v0.5.20-linux-x86_64.tar.gz` | enabled |
| `linux-aarch64` | `radar-v0.5.20-linux-aarch64.tar.gz` | enabled |
| `macos-x86_64` | `radar-v0.5.20-macos-x86_64.tar.gz` | enabled |
| `macos-aarch64` | `radar-v0.5.20-macos-aarch64.tar.gz` | enabled |
| `windows-x86_64` | `radar-v0.5.20-windows-x86_64.zip` | enabled |
| `windows-aarch64` | `radar-v0.5.20-windows-aarch64.zip` | enabled |

Apple Silicon is the `macos-aarch64` target. Windows ARM64 is
`windows-aarch64`. The 0.5.20 compressed release archives are 3.55 to
3.88 MiB; the unpacked binaries are 26.34 to 27.61 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).