Add resume and history system for makima (#1)

This PR implements a comprehensive resume and history system that enables:

1. **History Viewing**
   - View complete conversation history for contracts across all phases
   - View conversation history for individual tasks
   - View task output/tool call history with timestamps
   - View checkpoint history
   - Timeline view showing all activities

2. **Resume System**
   - Resume interrupted supervisor conversations with full context
   - Resume interrupted task conversations
   - Resume from specific checkpoints
   - Continue tasks from previous task state (worktree inheritance)

3. **Rewind/Restore Features**
   - Rewind code to any checkpoint (git restore)
   - Rewind conversation to any point
   - Create new branches from historical points
   - Fork tasks from any point in history

- New migration: 20250117000000_history_tables.sql
  - conversation_snapshots table for storing conversation state
  - history_events table for unified timeline
  - Added forking fields to tasks table
  - Added conversation_snapshot_id to task_checkpoints

- ConversationSnapshot, HistoryEvent, ConversationMessage
- Request/response types for resume and rewind operations
- Query filter types for history endpoints

- CRUD functions for conversation_snapshots
- CRUD functions for history_events
- Task conversation retrieval from task_events

- GET /api/v1/contracts/{id}/history
- GET /api/v1/contracts/{id}/supervisor/conversation
- GET /api/v1/mesh/tasks/{id}/conversation
- GET /api/v1/timeline
- POST /api/v1/contracts/{id}/supervisor/resume
- POST /api/v1/mesh/tasks/{id}/rewind
- POST /api/v1/mesh/tasks/{id}/fork
- POST /api/v1/mesh/tasks/{id}/checkpoints/{cid}/resume
- POST /api/v1/mesh/tasks/{id}/checkpoints/{cid}/branch
- POST /api/v1/contracts/{id}/supervisor/conversation/rewind

- task-history: View task conversation history
- task-checkpoints: List task checkpoints
- resume: Resume supervisor after interruption
- task-resume-from: Resume task from checkpoint
- task-rewind: Rewind task code to checkpoint
- task-fork: Fork task from historical point
- rewind-conversation: Rewind supervisor conversation

1 files changed, 8 insertions, 0 deletions

diff --git a/makima/src/server/mod.rs b/makima/src/server/mod.rs
index 0eba009..cf63f71 100644
--- a/makima/src/server/mod.rs
+++ b/makima/src/server/mod.rs
@@ -105,6 +105,11 @@ pub fn make_router(state: SharedState) -> Router {
         // Checkpoint endpoints
         .route("/mesh/tasks/{id}/checkpoint", post(mesh_supervisor::create_checkpoint))
         .route("/mesh/tasks/{id}/checkpoints", get(mesh_supervisor::list_checkpoints))
+        // Resume and rewind endpoints
+        .route("/mesh/tasks/{id}/rewind", post(mesh::rewind_task))
+        .route("/mesh/tasks/{id}/fork", post(mesh::fork_task))
+        .route("/mesh/tasks/{id}/checkpoints/{cid}/resume", post(mesh::resume_from_checkpoint))
+        .route("/mesh/tasks/{id}/checkpoints/{cid}/branch", post(mesh::branch_from_checkpoint))
         // Supervisor endpoints (for supervisor.sh)
         .route("/mesh/supervisor/contracts/{contract_id}/tasks", get(mesh_supervisor::list_contract_tasks))
         .route("/mesh/supervisor/contracts/{contract_id}/tree", get(mesh_supervisor::get_contract_tree))
@@ -156,6 +161,9 @@ pub fn make_router(state: SharedState) -> Router {
             "/contracts/{id}/chat/history",
             get(contract_chat::get_contract_chat_history).delete(contract_chat::clear_contract_chat_history),
         )
+        // Contract supervisor resume endpoints
+        .route("/contracts/{id}/supervisor/resume", post(mesh_supervisor::resume_supervisor))
+        .route("/contracts/{id}/supervisor/conversation/rewind", post(mesh_supervisor::rewind_conversation))
         // Contract daemon endpoints (for tasks to interact with contracts)
         .route("/contracts/{id}/daemon/status", get(contract_daemon::get_contract_status))
         .route("/contracts/{id}/daemon/checklist", get(contract_daemon::get_contract_checklist))