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/dream.rs

@@ -0,0 +1,54 @@
+use std::process::Command;
+
+/// Run one dream cycle
+pub fn run_dream() {
+    let memory_path = "memory/memory.md";
+
+    // 1. Check if memory is worth dreaming about
+    let memory = std::fs::read_to_string(memory_path).unwrap_or_default();
+    let line_count = memory.lines().count();
+
+    if line_count < 50 {
+        eprintln!("memory too short ({} lines), skipping dream", line_count);
+        return;
+    }
+
+    // 2. Announce dream
+    let _ = Command::new("colony")
+        .args(["post", "general", "💤 dreaming... back in a few minutes", "--type", "plan", "--quiet"])
+        .status();
+
+    // 3. Invoke Claude for dream cycle
+    eprintln!("dreaming... ({} lines of memory)", line_count);
+
+    let prompt = format!(
+        "Dream cycle. Read memory/memory.md ({} lines). \
+         Consolidate into themes and insights. \
+         Write a dream summary to memory/dreams/ with today's date. \
+         Prune memory/memory.md to the last 100 entries. \
+         If you've learned something about yourself, update your CLAUDE.md \
+         and add a line to the evolution log section.",
+        line_count
+    );
+
+    let status = Command::new("claude")
+        .args([
+            "--dangerously-skip-permissions",
+            "-p",
+            &prompt,
+            "--max-turns",
+            "10",
+        ])
+        .status();
+
+    match status {
+        Ok(s) if s.success() => eprintln!("dream completed"),
+        Ok(s) => eprintln!("dream exited with status: {}", s),
+        Err(e) => eprintln!("failed to run claude for dream: {}", e),
+    }
+
+    // 4. Announce return
+    let _ = Command::new("colony")
+        .args(["post", "general", "👁 back from dreaming", "--type", "plan", "--quiet"])
+        .status();
+}