feat(m-decomp): constraint upgrade

[csbobby]

M-Decompose Upgrade

Constraint Extraction and Validation

Description

• Constraint extraction refactored into a normalize-then-parse pipeline
  Added whitespace canonicalization, separator unification, and newline-aware block segmentation to eliminate layout- and order-sensitive parsing failures. Produces stable constraint IDs and consistent downstream bindings, significantly improving subtask–constraint determinism and template reproducibility.
• Introduced an explicit validation-decision stage
  Inserted between constraint extraction and code generation, emitting a constraint to validation-type mapping (e.g., llm / code). Validation strategy is now a first-class, inspectable, template-addressable feature, enabling different generation paths per constraint type.
• Validation code generation turns constraints into executable checking
  The validation_code_generator binds each constraint to a generated function stub in the V2. The CLI output shifts from a descriptive decomposition result to an importable, runnable validation module, allowing downstream systems to call validations directly and removing manual reinterpretation.

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[jakelorocco]

Please make sure to run the pre-commit hooks. There's some formatting issues scattered throughout the PR.

I also worry that this is continuing the trend of the decompose module not being melleaic (mostly that it doesn't use components for templating). But I guess it doesn't worsen the problem, so I'm just flagging it now for future consideration.

[csbobby]

:) The fixes are done @jakelorocco.

[csbobby]

Just found a small commit miss, so please ignore the review request today @jakelorocco. I will figure out that later and then rerun the checks.