feat(core): sync framework security hardening and accessibility improvements

- add util.Go with panic recovery for background goroutines
- add util.EscapeLike and explicit ESCAPE clause for SQL LIKE queries
- add DummyCheckPassword and subtle.ConstantTimeCompare against timing attacks
- enforce session ID rotation upon login/oauth callback to prevent session fixation
- add sliding window login failure rate limiting and oauth state rate limiting
- fix redis client capture race in pubsub listeners and wait on stop channel
- adjust global --primary to oklch(51.1% 0.262 276.966) for WCAG AA contrast
- fix semantic heading levels and missing aria-labels across UI components
- document security, concurrency, and a11y standards in AGENTS.md

internal/repository/task_execution.go

@@ -17,6 +17,7 @@ import (
 	db "github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	"github.com/Rain-kl/Wavelet/internal/infra/persistence/idgen"
 	"github.com/Rain-kl/Wavelet/internal/model"
+	"github.com/Rain-kl/Wavelet/pkg/util"
 )
 
 const (
@@ -153,7 +154,7 @@ func ListTaskExecutions(ctx context.Context, req model.ListTaskExecutionsRequest
 	} else if types := parseTaskTypesFilter(req.TaskTypes); len(types) > 0 {
 		query = query.Where("task_type IN ?", types)
 	} else if req.TaskTypePrefix != "" {
-		query = query.Where("task_type LIKE ?", req.TaskTypePrefix+"%")
+		query = query.Where("task_type LIKE ? ESCAPE '\\'", util.EscapeLike(req.TaskTypePrefix)+"%")
 	}
 
 	var total int64