chore(traces): put TRACES tags on their own line; regenerate the report

The parser reads a tag up to end of line, so `# TRACES: GR-004 | SR-001 —
prose` swallowed the prose into the tag and the row went unmatched. Splitting
the comment leaves the tag greppable by the same pattern as the code tags and
the commit trailers, which is the point of the house format.

Mechanical throughout; no logic touched. The regenerated report reflects this
session's new tags: 137 -> 148 found, and one more tagged-but-unexecuted, which
is the SuperHero accuracy assertion that is documented but not yet a test.

experiments/xsource/resolution_sweep.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 """Impact of input resolution on cross-source identification.
 
+TRACES: VR-013 | PR-002
+
 Gallery is built from one clip at NATIVE resolution. Probes come from the other
 clip with the WHOLE FRAME downscaled before it reaches the detector, so
 detection and landmark regression degrade together with the pixels. That is the