Add directive-first chain system redesign

Redesigns the chain system with a directive-first architecture where
Directive is the top-level entity (the "why/what") and Chains are
generated execution plans (the "how") that can be dynamically modified.

Backend:
- Add database migration for directive system tables
- Add Directive, DirectiveChain, ChainStep, DirectiveEvent models
- Add DirectiveVerifier and DirectiveApproval models
- Add orchestration module with engine, planner, and verifier
- Add comprehensive API handlers for directives
- Add daemon CLI commands for directive management
- Add directive skill documentation
- Integrate contract completion with directive engine
- Add SSE endpoint for real-time directive events

Frontend:
- Add directives route with split-view layout
- Add 6-tab detail view (Overview, Chain, Events, Evaluations, Approvals, Verifiers)
- Add React Flow DAG visualization for chain steps
- Add SSE subscription hook for real-time event updates
- Add useDirectives and useDirectiveEventSubscription hooks
- Add directive types and API functions

Fixes:
- Fix test failures in ws/protocol, task_output, completion_gate, patch
- Fix word boundary matching in looks_like_task()
- Fix parse_last() to find actual last completion gate
- Fix create_export_patch when merge-base equals HEAD
- Clean up clippy warnings in new code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2 files changed, 11 insertions, 14 deletions

diff --git a/makima/src/daemon/task/completion_gate.rs b/makima/src/daemon/task/completion_gate.rs
index 69b7c6a..40a6466 100644
--- a/makima/src/daemon/task/completion_gate.rs
+++ b/makima/src/daemon/task/completion_gate.rs
@@ -5,7 +5,7 @@
 //! development framework.
 //!
 //! Format:
-//! ```
+//! ```text
 //! <COMPLETION_GATE>
 //! ready: true|false
 //! reason: "explanation of completion status"
@@ -133,19 +133,18 @@ impl CompletionGate {
     /// This is useful when Claude produces multiple completion gates during
     /// a long-running task, and we want to use the final status.
     pub fn parse_last(text: &str) -> Option<Self> {
+        let start_tag = "<COMPLETION_GATE>";
         let end_tag = "</COMPLETION_GATE>";
-        let mut last_gate = None;
-        let mut search_start = 0;
 
-        while let Some(end_idx) = text[search_start..].find(end_tag) {
-            let absolute_end = search_start + end_idx + end_tag.len();
-            if let Some(gate) = Self::parse(&text[..absolute_end]) {
-                last_gate = Some(gate);
-            }
-            search_start = absolute_end;
-        }
+        // Find the last occurrence of the start tag
+        let start_idx = text.rfind(start_tag)?;
+        let remaining = &text[start_idx..];
+
+        // Find the end tag after the last start tag
+        let end_idx = remaining.find(end_tag)?;
 
-        last_gate
+        // Parse just this last gate
+        Self::parse(&remaining[..end_idx + end_tag.len()])
     }
 }
 
diff --git a/makima/src/daemon/task/state.rs b/makima/src/daemon/task/state.rs
index 7b59b62..fe73de1 100644
--- a/makima/src/daemon/task/state.rs
+++ b/makima/src/daemon/task/state.rs
@@ -124,9 +124,7 @@ impl Default for TaskState {
 
 #[cfg(test)]
 mod tests {
-    #[allow(unused_imports)]
-    use crate::daemon::*;
-    use super::TaskState;
+    use super::*;
 
     #[test]
     fn test_valid_transitions() {