Preserve callable history parameter types

[luisleo526]

Summary

• propagate exact bool, int, int64, and float Series types through callable history reads
• preserve type and NA width through aliases, wrappers, terminal selections, nz/fixnan, and reassignment
• fail closed when history use cannot resolve one safe parameter profile
• add Pine v6 compile/runtime regressions for direct UDFs, methods, nested wrappers, first-bar NA, and mutable aliases

Validation

• focused native lifecycle probes: 15/15 passed
• private adversarial probes: 3/3 passed
• complete native pytest suite: passed
• Pyodide gate: 277/277 classified, including 263 OK and 14 expected errors
• frozen exact915: 903 OK and 12 expected errors, zero status drift
• 186 changed generated outputs: native A/B found zero candidate regressions
• fresh same-engine Standard A/B: 134/134 tape, tier, metrics, gates, inputs, and source hashes identical
  • all 119 affected Excellent rows were byte-identical
  • all 14 affected graded non-Excellent rows were identical

This is a correctness milestone and intentionally score-neutral: it removes callable history type corruption without changing validated strategy behavior.