feat: Simplify phase deliverables and add 'execute' contract type

## Changes

### Phase Deliverables Simplified
- **Simple contract type**:
  - Plan phase: Only 'Plan' deliverable (required)
  - Execute phase: Only 'PR' deliverable (required)

- **Specification contract type**:
  - Research phase: Only 'Research Notes' deliverable (required)
  - Specify phase: Only 'Requirements Document' deliverable (required)
  - Plan phase: Only 'Plan' deliverable (required)
  - Execute phase: Only 'PR' deliverable (required)
  - Review phase: Only 'Release Notes' deliverable (required)

### New 'execute' Contract Type
- Only has 'execute' phase (no plan or review phases)
- NO deliverables at all - executes tasks directly
- Added to ContractType enum with proper Display/FromStr implementations
- Added helper methods: `initial_phase()`, `terminal_phase()`

### API Updates
- Added `get_phase_deliverables_for_type()` for contract-type-aware deliverables
- Added `get_phase_checklist_for_type()` for contract-type-aware checklists
- Added `check_phase_completion_for_type()` for contract-type-aware completion checks
- Legacy functions remain for backward compatibility (default to 'simple' type)

### Files Modified
- makima/src/llm/phase_guidance.rs - Core deliverable definitions
- makima/src/db/models.rs - ContractType enum and Contract methods
- makima/src/llm/mod.rs - Export new functions
- makima/src/server/handlers/contract_daemon.rs - Use type-aware functions
- makima/src/server/handlers/contract_chat.rs - Use type-aware functions

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

1 files changed, 30 insertions, 6 deletions

diff --git a/makima/src/db/models.rs b/makima/src/db/models.rs
index 58f4da1..0c1d9f2 100644
--- a/makima/src/db/models.rs
+++ b/makima/src/db/models.rs
@@ -1108,15 +1108,19 @@ pub struct MergeCompleteCheckResponse {
 pub enum ContractType {
     /// Simple Plan -> Execute workflow (default)
     /// - Plan phase: requires a "Plan" document
-    /// - Execute phase: no documents, fulfills the plan
+    /// - Execute phase: requires a "PR" document
     Simple,
     /// Specification-based development with TDD
-    /// - Research: gather requirements and context
-    /// - Specify: write specifications and test cases
-    /// - Plan: create implementation plan
-    /// - Execute: implement according to specs
-    /// - Review: verify against specifications
+    /// - Research: requires "Research Notes" document
+    /// - Specify: requires "Requirements Document"
+    /// - Plan: requires "Plan" document
+    /// - Execute: requires "PR" document
+    /// - Review: requires "Release Notes" document
     Specification,
+    /// Execute-only workflow with no deliverables
+    /// - Only has "execute" phase
+    /// - NO deliverables at all - just execute tasks directly
+    Execute,
 }
 
 impl Default for ContractType {
@@ -1130,6 +1134,7 @@ impl std::fmt::Display for ContractType {
         match self {
             ContractType::Simple => write!(f, "simple"),
             ContractType::Specification => write!(f, "specification"),
+            ContractType::Execute => write!(f, "execute"),
         }
     }
 }
@@ -1141,6 +1146,7 @@ impl std::str::FromStr for ContractType {
         match s.to_lowercase().as_str() {
             "simple" => Ok(ContractType::Simple),
             "specification" => Ok(ContractType::Specification),
+            "execute" => Ok(ContractType::Execute),
             _ => Err(format!("Unknown contract type: {}", s)),
         }
     }
@@ -1347,9 +1353,27 @@ impl Contract {
                 ContractPhase::Execute,
                 ContractPhase::Review,
             ],
+            "execute" => vec![ContractPhase::Execute], // Execute-only, single phase
             _ => vec![ContractPhase::Plan, ContractPhase::Execute], // Default to simple
         }
     }
+
+    /// Get the initial phase for this contract type
+    pub fn initial_phase(&self) -> ContractPhase {
+        match self.contract_type.as_str() {
+            "specification" => ContractPhase::Research,
+            "execute" => ContractPhase::Execute,
+            _ => ContractPhase::Plan, // simple and default
+        }
+    }
+
+    /// Get the terminal phase for this contract type (phase where contract can be completed)
+    pub fn terminal_phase(&self) -> ContractPhase {
+        match self.contract_type.as_str() {
+            "specification" => ContractPhase::Review,
+            _ => ContractPhase::Execute, // simple and execute both end at execute
+        }
+    }
 }
 
 /// Contract repository record from the database