Upload-defaults hardening: route i207 worker through hub, test the runner merged-gate, exclude checkpoint-* from persist path

kind: infra

track:

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Goal

Close the three minor code follow-ups from the 2026-06-10 independent review of the adapter-canonical upload-defaults fix (merged @ c5bc6149c).

scripts/run_i207_gentle_worker.py:156 — direct api.upload_folder bypasses TRAINING_STATE_IGNORE_PATTERNS; route through hub.upload_model.
Add a focused test for the runner gate (runner.py:291): mock run_two_phase_training + upload_model, assert no merged upload by default / upload under EPM_UPLOAD_MERGED=1 / upload under distributed=True. (The headline behavior change currently has zero direct coverage.)
_maybe_persist_adapter: pass ignore_patterns=["checkpoint-*"] so per-checkpoint adapter snapshots stop shipping on the persist path (safe strengthening; verify no flow reads them back).

kind: infra, no GPU. Reviewer verdict was PASS — these are hardening, not defects.

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