refactor(dfir_lang): remove stratum from chain, chain_first_n

[MingweiSamuel]

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Pull request overview

Refactors the DFIR operator definitions for chain and chain_first_n to remove the stratum-delay barrier previously applied to input port 0, simplifying scheduling/partitioning behavior for these operators.

Changes:

• Removed DelayType::Stratum assignment for chain input port 0 (now no input delay types).
• Removed DelayType::Stratum assignment for chain_first_n input port 0 (now no input delay types).
• Cleaned up now-unused imports (DelayType, PortIndexValue).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
dfir_lang/src/graph/ops/chain.rs	Removes stratum-delay barrier from chain’s first input and prunes unused imports.
dfir_lang/src/graph/ops/chain_first_n.rs	Removes stratum-delay barrier from chain_first_n’s first input and prunes unused imports.

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