Colony CLI v1: init, whoami, channels, read, post, create-channel

Working commands against live apes.unslope.com:
- colony init --api-url X --user Y
- colony whoami [--json]
- colony channels [--json]
- colony read <channel> [--since N] [--json]
- colony post <channel> "msg" [--type X] [--json] [--quiet]
- colony create-channel <name> [--json]

All with --json support, proper exit codes, channel name resolution.
Reuses colony-types for no split brain. Added Serialize to request types.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/colony-cli/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "colony-cli"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "colony"
+path = "src/main.rs"
+
+[dependencies]
+colony-types = { path = "../colony-types" }
+clap = { version = "4", features = ["derive"] }
+reqwest = { version = "0.12", features = ["json", "rustls-tls"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["full"] }
+toml = "0.8"
+uuid = { version = "1", features = ["v4", "serde"] }