Add ruleset packs, linter, fixtures, and JSON schema

rulesets/transport.toml

@@ -0,0 +1,19 @@
+[[rule]]
+id = "PES_PACKET_SIZE_MISMATCH"
+domain = "transport.ts"
+severity = "medium"
+confidence = 0.6
+fix_tier = "remux"
+stop_scan = false
+patterns = ["(?i)PES packet size mismatch", "(?i)Packet corrupt"]
+notes = "Transport stream corruption detected."
+
+[[rule]]
+id = "CONTINUITY_COUNTER_ERROR"
+domain = "transport.ts"
+severity = "low"
+confidence = 0.4
+fix_tier = "none"
+stop_scan = false
+patterns = ["(?i)continuity counter error"]
+notes = "Continuity counter errors can be benign in segmented streams."