[PresetCLI] Refactor preset into reusable class#5535

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hujc7 wants to merge 15 commits into

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hujc7:jichuanh/preset-cli

Commits on May 10, 2026

Add typed --physics/--renderer/--presets CLI flags
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Accept PresetCfg variant names without re-decoration
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Strict-anchor rule for variants + name/type mismatch lint
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Address review: variant walker mirrors resolver, defensive parses
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Address review round 2: walker mirrors resolver everywhere, retry on task change
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Address review round 3: separate walk view from preset alternatives view
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Address review round 4: class-first recursion through PresetCfg alternatives
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Address review round 5: argv pre-scan honors `--` and documents abbrev
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Pre-scan: reject ``--task --`` so the syntax error surfaces from argparse
hujc7
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