feat(bench): automate B7 shader profiles, wire B12b trials, settle 45s

- gen_shader_profiles.py + shader-profiles/: Iris per-pack option files
  resolved from each pack's profile.* lines (Iris has no profile key)
- bench.py: flag rows shader_not_loaded when Iris falls back to vanilla
  rendering (analyze.py treats it as invalid)
- matrix: shader_options session key, trial jar globs pinned to the
  downloaded Modrinth builds, post-join settle 45 s (B0 v1 showed rep 1
  still warming at 10 s)

analysis/client-perf/harness/analyze.py

@@ -22,7 +22,8 @@ import statistics
 import sys
 from pathlib import Path
 
-INVALID = {"crashed", "timeout", "no_data", "no_markers", "low_n", "vsync_suspect"}
+INVALID = {"crashed", "timeout", "no_data", "no_markers", "low_n", "vsync_suspect",
+           "shader_not_loaded"}
 DEFAULT_FILE = Path.home() / "onion-bench" / "results" / "session.jsonl"