Public-flip audit: scrub audit-ticket prefixes + LAN refs + tighten README

URLs → git.sulkta.com. Audit-ticket prefixes (SPEC §N, audit Track X, vc=N
audit-fix, FIX (audit ...), PORT DEVIATION) stripped from comments — technical
reasoning retained. Crafting-table LAN refs softened to 'Sulkta build host'.
README sheds marketing scaffolding + stale status tables.

src/youtube/stream_extractor.rs

@@ -1,9 +1,9 @@
 // YoutubeStreamExtractor — orchestrator. Mirrors NPE
 // services/youtube/extractors/YoutubeStreamExtractor.java:onFetchPage().
 //
-// Order (per audit Track C §1.2):
-//   1. Optional Android po_token from PoTokenProvider (Phase 5 wires this;
-//      until then we always go anonymous → reel endpoint).
+// Order:
+//   1. Optional Android po_token from PoTokenProvider (until a provider
+//      is registered we always go anonymous → reel endpoint).
 //   2. Android `/player` (if po_token) or `/reel/reel_item_watch` (anon).
 //      checkPlayabilityStatus → typed ContentUnavailable variants.
 //      isPlayerResponseNotValid → reject the "you're a bot" decoy.
@@ -12,7 +12,7 @@
 //      Exceptions swallowed → falls back to Android-response thumbnails.
 //   5. WEB `/next` — description + related + chapters. Mandatory.
 //
-// Per-format URL post-processing (audit Track C §4.1):
+// Per-format URL post-processing:
 //   * If format has `url` → use as-is (Android + iOS path).
 //   * Else parse `signatureCipher` → deobfuscate `s` → assemble
 //     `url&sp=<decoded>` (WEB path; not exercised in the current
@@ -699,9 +699,8 @@ fn codec_from_mime(fmt: &Value) -> Option<String> {
     Some(after[..end].to_string())
 }
 
-/// FIX (NPE deviation flagged in SPEC §5): dedup by itag id + delivery
-/// method, NOT by `mediaFormat.id` — NPE's dedup collides itag 140 and
-/// 141 because both are M4A.
+/// Dedup by itag id + delivery method, NOT by `mediaFormat.id` — NPE's
+/// dedup collides itag 140 and 141 because both are M4A.
 fn push_audio_dedup(list: &mut Vec<AudioStream>, candidate: AudioStream) {
     if list
         .iter()