docs(context): document the live HF discovery chain subjects

[POWERFULMOVES]

Adds hf.model.discovered.v1 (hf-agent → hf-research-agent) and hf.model.evaluated.v1 (hf-research-agent → model-registry G4) to the NATS subjects context — both missing despite the chain being live-validated on SPARK 2026-08-31 (2275 models discovered, scoring active at threshold 110). Companion to the PMOVES-autoresearch dossier fill (its fork PR #1).

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-01T03:51:21.027971Z	d6f5624	PR opened

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Reviewed commit: d6f56240f3

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[chatgpt-codex-connector]

Document the actual 50-point registration threshold

For operators using this catalog to predict G4 registration, 110 is the maximum attainable evaluation score, not the auto-registration threshold. At this commit, HF_MIN_SCORE defaults to 50 in both Compose and hf-research-agent, while model-registry independently registers every evaluation scoring at least 50 and does not inspect passed; therefore models scoring 50–109 are auto-registered despite this entry. State 50 here, or distinguish the 110-point scale maximum from the pass and G4 thresholds.

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