revert: profile overrides for artifact dependencies (#597)

[wan9chi]

Motivation

#597 worked around Cargo compiling [build-dependencies] artifact deps with the build-override profile (opt-level 0 in release; rust-lang/cargo#16719) using per-package [profile.release.package.*] overrides plus the artifact_profile build-script guard. The next PR in this stack (#636) moves the artifact cdylibs to [dependencies], where the normal release profile applies in this workspace and every downstream one — making both the overrides and the guard dead machinery.

What this does

Reverts #597 (5ed7a5a): removes the three profile-override blocks, the artifact_profile crate, and its build-script guard calls from the preload and napi crates.

Note: artifact cdylibs build unoptimized between this PR and #636; the stack lands together.

🤖 Generated with Claude Code

[github-actions]

fspy benchmark

linux

dynamic/launch             change  +6.19%  [ -4.38% .. +17.89%]  overhead   +57.94%
dynamic/access             change +52.14%  [+48.62% .. +60.15%]  overhead   +62.00%
dynamic/access-relative    change +88.74%  [+68.53% .. +93.43%]  overhead  +175.20%
static/launch              change  +1.79%  [ -7.45% .. +12.72%]  overhead  +151.65%
static/access              change  -0.46%  [ -3.06% ..  +1.96%]  overhead  +824.03%
static/access-relative     change  -0.04%  [ -4.92% ..  +3.49%]  overhead +1337.51%

macos

dynamic/launch             change  +0.47%  [ -3.33% ..  +4.24%]  overhead  +217.13%
dynamic/access             change +28.04%  [+17.42% .. +42.25%]  overhead   +39.45%
dynamic/access-relative    change +17.36%  [ +2.13% .. +32.37%]  overhead  +320.76%

windows

dynamic/launch             change  +2.30%  [ -5.73% ..  +9.88%]  overhead   +28.69%
dynamic/access             change  +6.76%  [ +2.54% .. +18.90%]  overhead    +8.30%
dynamic/access-relative    change  +6.56%  [ +1.83% .. +15.30%]  overhead    +8.19%