Ship floating launcher, automatic discovery and bounded media search improvements

tools/relevance-eval/policies/hybrid-tail-v1.json

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+{
+  "policy_id": "hybrid-semantic-tail-gap070-v1",
+  "scope": "hybrid semantic candidates before reciprocal-rank fusion",
+  "minimum_adjacent_gap_exclusive": 0.07,
+  "derivation": "Rounded upward from maximum adjacent gap 0.06504970788955688 among eight calibration All-files absence requests",
+  "calibration_report_sha256": "56f42c523527dd748918bb8f17be6bd7818158227e692fccaf387d915f9d0a94",
+  "boundary": "largest adjacent raw cosine gap in existing filtered file-deduplicated candidate list",
+  "equal_largest_gaps": "retain all; numeric tie tolerance is twice f32 EPSILON",
+  "preserve": ["strongest semantic candidate", "all independent lexical candidates", "exact filename and identifier priority", "raw semantic diagnostic API"],
+  "claims": ["prunes clearly separated weak semantic tails"],
+  "not_claimed": ["no-answer detection", "calibrated confidence", "universal embedding threshold", "new held-out or human quality certification"]
+}