feat(08-02): add 25 GitHub dorks for frontier and specialized categories

- frontier.yaml: 15 dorks covering Tier 1/2 providers (OpenAI, Anthropic,
  Google AI, Azure OpenAI, AWS Bedrock, xAI, Cohere, Mistral, Groq,
  Together, Replicate)
- specialized.yaml: 10 dorks covering Tier 3 providers (Perplexity,
  Voyage, Jina, AssemblyAI, Deepgram, ElevenLabs, Stability, HuggingFace)
- Extend loader to accept YAML list format in addition to single-dork
  mapping, enabling multi-dork files for Wave 2+ plans
- Mirror all YAMLs into dorks/github/ (user-visible) and
  pkg/dorks/definitions/github/ (go:embed target)

pkg/dorks/loader.go

@@ -43,10 +43,27 @@ func loadDorks() ([]Dork, error) {
 		if err != nil {
 			return fmt.Errorf("reading dork file %s: %w", path, err)
 		}
+		// Support two YAML shapes:
+		//   1. A top-level list of Dork entries (preferred, used by Wave 2+ plans).
+		//   2. A single Dork as a top-level mapping (legacy one-per-file form).
+		var list []Dork
+		if err := yaml.Unmarshal(data, &list); err == nil && len(list) > 0 {
+			for _, dk := range list {
+				if err := dk.Validate(); err != nil {
+					return fmt.Errorf("validating dork %s (%s): %w", path, dk.ID, err)
+				}
+				dorks = append(dorks, dk)
+			}
+			return nil
+		}
 		var dk Dork
 		if err := yaml.Unmarshal(data, &dk); err != nil {
 			return fmt.Errorf("parsing dork %s: %w", path, err)
 		}
+		if strings.TrimSpace(dk.ID) == "" {
+			// Empty file or placeholder (e.g., .gitkeep-adjacent empty YAML) — ignore.
+			return nil
+		}
 		if err := dk.Validate(); err != nil {
 			return fmt.Errorf("validating dork %s: %w", path, err)
 		}