feat: Add bd repos multi-repo commands and fix bd ready for in_progress issues

- Add 'bd repos' command for multi-repository management (bd-123)
  - bd repos list: show all cached repositories
  - bd repos ready: aggregate ready work across repos
  - bd repos stats: combined statistics across repos
  - bd repos clear-cache: clear repository cache
  - Requires global daemon (bd daemon --global)

- Fix bd ready to show in_progress issues (bd-165)
  - bd ready now shows both 'open' and 'in_progress' issues with no blockers
  - Allows epics/tasks ready to close to appear in ready work
  - Critical P0 bug fix for workflow

- Apply code review improvements to repos implementation
  - Use strongly typed RPC responses (remove interface{})
  - Fix clear-cache lock handling (close connections outside lock)
  - Add error collection for per-repo failures
  - Add context timeouts (1-2s) to prevent hangs
  - Add lock strategy comments

- Update documentation (README.md, AGENTS.md)
- Add comprehensive tests for both features

Amp-Thread-ID: https://ampcode.com/threads/T-1de989a1-1890-492c-9847-a34144259e0f
Co-authored-by: Amp <amp@ampcode.com>

internal/storage/sqlite/ready.go

@@ -10,18 +10,20 @@ import (
 )
 
 // GetReadyWork returns issues with no open blockers
+// By default, shows both 'open' and 'in_progress' issues so epics/tasks
+// ready to close are visible (bd-165)
 func (s *SQLiteStorage) GetReadyWork(ctx context.Context, filter types.WorkFilter) ([]*types.Issue, error) {
 	whereClauses := []string{}
 	args := []interface{}{}
 
-	// Default to open status if not specified
+	// Default to open OR in_progress if not specified (bd-165)
 	if filter.Status == "" {
-		filter.Status = types.StatusOpen
+		whereClauses = append(whereClauses, "i.status IN ('open', 'in_progress')")
+	} else {
+		whereClauses = append(whereClauses, "i.status = ?")
+		args = append(args, filter.Status)
 	}
 
-	whereClauses = append(whereClauses, "i.status = ?")
-	args = append(args, filter.Status)
-
 	if filter.Priority != nil {
 		whereClauses = append(whereClauses, "i.priority = ?")
 		args = append(args, *filter.Priority)