refactor: consolidate trampoline signature creation

[y1yang0]

consolidate trampoline signature creation

simplify trampoline generation overall

[codecov]

Codecov Report

❌ Patch coverage is 89.54248% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.86%. Comparing base (659941e) to head (3a89a69).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
tool/internal/instrument/trampoline.go	91.15%	8 Missing and 5 partials ⚠️
tool/ex/error.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #208 +/- ## ========================================== - Coverage 43.34% 42.86% -0.49%  ========================================== Files 37 37 Lines 2314 2319 +5 ========================================== - Hits 1003 994 -9  - Misses 1240 1250 +10  - Partials 71 75 +4 

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[txabman42]

Why are we unsupporting this?

[y1yang0]

The c.params field stores pointers to pointers. Given this, it's better to fail completely rather than return partially correct and partially incorrect data.

For example, if c.params[1] is bad but *(c.params[2].(*string)) is good, the inconsistent result could lead to subtle and hard-to-debug issues. A complete failure is safer and more predictable.