refactor: extract all hardcoded values to constants (v0.8.1)

Fix all 63 hardcoded value issues from Guardian self-check:
- Remove hardcoded Slack token from documentation
- Remove aws-sdk framework leak from domain layer
- Rename 4 pipeline files to verb-noun convention
- Extract 57 magic strings to SecretExamples.ts constants
- Update SecretViolation, SecretDetector, MagicStringMatcher
- Use typeof for TypeScript literal type in getSeverity()

Result: 0 issues in Guardian self-check (was 63)
All 566 tests passing, build successful

packages/guardian/src/shared/constants/rules.ts

@@ -103,32 +103,35 @@ export const NAMING_PATTERNS = {
  * Common verbs for use cases
  */
 export const USE_CASE_VERBS = [
+    "Aggregate",
     "Analyze",
-    "Create",
-    "Update",
-    "Delete",
-    "Get",
-    "Find",
-    "List",
-    "Search",
-    "Validate",
-    "Calculate",
-    "Generate",
-    "Send",
-    "Fetch",
-    "Process",
-    "Execute",
-    "Handle",
-    "Register",
+    "Approve",
     "Authenticate",
     "Authorize",
-    "Import",
-    "Export",
-    "Place",
+    "Calculate",
     "Cancel",
-    "Approve",
-    "Reject",
+    "Collect",
     "Confirm",
+    "Create",
+    "Delete",
+    "Execute",
+    "Export",
+    "Fetch",
+    "Find",
+    "Generate",
+    "Get",
+    "Handle",
+    "Import",
+    "List",
+    "Parse",
+    "Place",
+    "Process",
+    "Register",
+    "Reject",
+    "Search",
+    "Send",
+    "Update",
+    "Validate",
 ] as const
 
 /**