Jwilber/update conv schedule

[jwilber]

Update schedule to run less frequent, and update esm2 jobs:

• .github/workflows/scdl-performance-tests.yml — scdl now runs weekly on Fridays 2pm PST (0 22 * * 5) instead of daily.

• .github/workflows/convergence-tests.yml — single cron 0 8 * * 0 (Sun 00:00 PST = Sat night midnight), a new gate-biweekly job that skips odd ISO weeks, and the matrix runs all three configs (esm2_650m, esm2_15b, codonfm_ptl_te) on every scheduled run.

• ci/lepton/.../esm2_native_te_15b.yaml — num_train_steps: 20_000 → 500.

• ci/lepton/.../esm2_native_te_650m.yaml — added top-level fp8_recipe/fp8_format, two new FP8 products (bshd+fp8, thd+fp8) mirroring the 15b config, and extended run_script to pass both fp8 params.

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[jwilber]

/ok to test 7883b85