colony-agent: implement worker loop + dream cycle

Worker:
- run_pulse(): check inbox → heartbeat → HEARTBEAT_OK or invoke Claude
- run_worker_loop(): forever loop with 30s/10s sleep
- Builds prompt from inbox items + heartbeat.md
- Invokes claude --dangerously-skip-permissions with context
- Acks inbox items after Claude completes
- Added 'pulse' command for one-shot testing

Dream:
- Checks memory.md line count (skip if < 50)
- Posts "dreaming..." to #general
- Invokes Claude to consolidate, prune, evolve
- Posts "back from dreaming" when done

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

crates/colony-agent/src/main.rs

@@ -1,3 +1,6 @@
+mod dream;
+mod worker;
+
 use clap::{Parser, Subcommand};
 
 #[derive(Parser)]
@@ -13,6 +16,8 @@ enum Commands {
     Worker,
     /// Run one dream cycle (memory consolidation)
     Dream,
+    /// Run one pulse cycle (check inbox, respond if needed)
+    Pulse,
     /// Create a new agent on this VM
     Birth {
         name: String,
@@ -29,12 +34,14 @@ async fn main() {
 
     match cli.command {
         Commands::Worker => {
-            eprintln!("colony-agent: worker not yet implemented");
-            std::process::exit(1);
+            worker::run_worker_loop("");
+        }
+        Commands::Pulse => {
+            worker::run_pulse("");
+            eprintln!("pulse complete");
         }
         Commands::Dream => {
-            eprintln!("colony-agent: dream not yet implemented");
-            std::process::exit(1);
+            dream::run_dream();
         }
         Commands::Birth { name, instruction } => {
             eprintln!("colony-agent: birth '{}' with instruction: {}", name, instruction);