docs: renumber to DR-150/151/152 after rebase onto master

master landed DR-148 and DR-149 for unrelated audio-decode work (0.4.7/0.4.8)
while this branch was in flight, and both sides claimed the same two IDs. The
native-video requirements move to DR-150 (native rendering behind the flag),
DR-151 (the severed SurfaceView attach chain) and DR-152 (capabilities reported
by Rust). UT-090 was likewise already taken by the seek-bar test, so the adapter
selection test moves to UT-149 and is registered in the table.

The spec header also cited DR-023/DR-024, which are the subtitle and audio-track
selection UI requirements — unrelated to this work. Corrected, with a note so the
wrong IDs are not reintroduced from the draft.

extract-traces.test.ts asserts the live requirement counts on purpose, so adding
three DRs moves DR 144→147 and total 282→285.

Subtitles on the native path are not a regression from this branch: master's
6a712c4 already fixed the root cause (MediaItem.subtitles was hardcoded to
vec![], so ExoPlayer always received zero SubtitleConfigurations) and that fix is
now underneath these commits.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/traceability.md

@@ -1,6 +1,6 @@
 # Code Traceability Matrix
 
-**Generated:** 8/11/2026, 6:53:36 PM
+**Generated:** 8/11/2026, 6:56:13 PM
 
 ## Summary