fix(synthesize): live-calibrated threshold 0.65 + per-cluster member cap - #107
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The 0.35 default was tuned on synthetic pair measurements; against the real memory store it chained dense early-harvest noise into a 209-member mega-cluster whose single learning could not preserve the members' facts. Live dry runs show 0.65 yields coherent 4-15 member topic groups. New --max-cluster (default 20) hard-caps any cluster to the anchor plus its most similar members; overflow stays unsuperseded for a later pass.
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Part of #36. Follow-up to #106 caught during live verification on LXC 122: the 0.35 sibling threshold (tuned on synthetic pair measurements) chained dense early-harvest noise into a 209-member mega-cluster. Live dry runs at 0.45/0.55/0.65 show 0.65 produces coherent 4-15 member topic groups.
SIBLING_THRESHOLD0.35 -> 0.65 (rationale comment updated with the live calibration).--max-cluster(default 20): hard per-cluster ceiling, keeps the anchor plus its most similar members; overflow stays unsuperseded and regroups on a later pass.Gate: ruff clean, 769 tests pass (cap-behaviour test added). Live verify after merge: dry run on LXC 122 must show bounded clusters.