feat: publish-ready overhaul — lints, tests, docs, CI, fuzzing, mutant testing

- Enable clippy pedantic + nursery lints; fix all warnings
- Add config validation (SF, CR, frequency range checks)
- Zeroize passphrase intermediates after key derivation
- Convert to lib+bin crate for fuzz target accessibility
- Replace Vec with VecDeque for O(1) log/bucket rotation
- Add TUI minimum terminal size guard

Testing:
- 145 unit + property tests (was 15)
- 6 proptest groups (frame roundtrip, hash, SNR, air time, peer list, padding)
- 2 cargo-fuzz targets (gossip frame decode, peer list decode)
- cargo-mutants: 0 missed, 241 caught, 54 unviable

Documentation:
- README with prerequisites, quick start, config reference, architecture
- Module-level and item-level rustdoc on all public items
- LICENSE (MIT), rustfmt.toml, .gitignore

Infrastructure:
- GitHub Actions CI (fmt, clippy, test, audit)
- cargo-mutants config (.cargo/mutants.toml)
- justfile for common tasks

Cargo.toml

@@ -5,6 +5,13 @@ edition = "2024"
 authors = ["Stephen Waits <steve@waits.net>"]
 license = "MIT"
 description = "Peer-to-peer LoRa bridge using iroh and DongLoRa"
+repository = "https://github.com/swaits/donglora-bridge"
+homepage = "https://github.com/swaits/donglora-bridge"
+keywords = ["lora", "bridge", "gossip", "p2p", "iot"]
+categories = ["network-programming", "command-line-utilities"]
+readme = "README.md"
+rust-version = "1.94.1"
+exclude = [".jj/", ".github/"]
 
 [dependencies]
 donglora-client = { path = "../donglora/clients/rust" }
@@ -14,10 +21,10 @@ mainline = { version = "6", features = ["async"] }
 tokio = { version = "1", features = ["full"] }
 clap = { version = "4", features = ["derive"] }
 serde = { version = "1", features = ["derive"] }
-toml = "0.8"
+toml = "1"
 blake3 = "1"
-ratatui = "0.29"
-crossterm = "0.28"
+ratatui = "0.30"
+crossterm = "0.29"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tracing-appender = "0.2"
@@ -30,8 +37,18 @@ hex = "0.4.3"
 sha2 = "0.10"
 tokio-util = { version = "0.7.18", features = ["rt"] }
 jiff = "0.2.23"
+zeroize = "1"
+
+[dev-dependencies]
+proptest = "1"
+tempfile = "3"
 
 [lints.clippy]
+pedantic = { level = "warn", priority = -1 }
+nursery = { level = "warn", priority = -1 }
 unwrap_used = "deny"
 expect_used = "deny"
 panic = "deny"
+similar_names = "allow"
+module_name_repetitions = "allow"
+missing_errors_doc = "allow"