fix(validation): preserve pytest retry semantics across modes

[8Dionysus]

Summary

• Record the final pytest partition baseline after last-failed filtering has run.
• Keep stateful stepwise and non-executing pytest modes on native serial execution, including options from argv, PYTEST_ADDOPTS, and config addopts.
• Derive retry hints from completed teardown and reported failures so session-policy failures do not cache passing selections.
• Refresh the canonical repo-local KAG generated family and its budget receipt.

Verification

• python -m pytest -q tests/test_validation_command_authority.py — 52 passed.
• Explicit process scheduler over the same command-authority file — 52 passed in 4 shards.
• Ruff, targeted mypy, and git diff --check passed.
• Three paired whole-command samples over the unchanged 19-test product-validator selection; all six runs passed with exact 4-shard union. Samples are reported as measurements, not a speedup claim.
• Pinned aoa-kag owner-family preparation and post-apply sentinel/full-parity/family-contract/compatibility-assembly gate passed.

The generated family is projection-only; no runtime, deployment, host, or release-authority behavior is changed.

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