fix(bootstrap): wrong directory on first run

[vmeurisse]

Summary

Current bootstrap code switch directory to the project directory on first install (which is hardcoded to be 2 parents up from the bootstrap script).
This fails when calling command with relative path, if the project directory is not 2 level up, or if the user was not at the root of the project.
Once mise is installed, no directory change happen.

$ /bin/mise generate bootstrap --write mise.sh
Wrote to mise.sh
$ rm ~/.cache/mise/mise-2025.11.4
$ ./mise.sh exec -- ./test.sh
mise: installing mise...
################################################################################################################################################### 100.0%
mise: installed successfully to /home/user/.cache/mise/mise-2025.11.4
mise ERROR "./test.sh" couldn't exec process: No such file or directory
mise ERROR Run with --verbose or MISE_VERBOSE=1 for more information
$ ./mise.sh exec -- ./test.sh
OK

This fix restore the current working directory after install.
I also simplified the code that generate project_dir to avoid 2 subshell.

Test plan

Manually tested the generated bootstrap with and without the --localize option.

$ cargo run generate bootstrap --write mise.sh
Wrote to mise.sh
$ rm ~/.cache/mise/mise-2025.11.4
$ ./mise.sh exec -- ./test.sh
mise: installing mise...
################################################################################################################################################### 100.0%
mise: installed successfully to /home/user/.cache/mise/mise-2025.11.4
OK
$ ./mise.sh exec -- ./test.sh
OK

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Note

Keeps the original working directory after first-time install and simplifies localized project_dir detection, removing MISE_BOOTSTRAP_PROJECT_DIR usage.

• Bootstrap script generation:
  • Restore original working directory after inline install by saving $PWD and cd-ing back.
  • Simplify project_dir resolution in localized mode using the script path (${BASH_SOURCE[0]}) and cd ...
  • Remove MISE_BOOTSTRAP_PROJECT_DIR and related directory switching; keep localized env exports and MISE_INSTALL_PATH setup intact.

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[jdx]

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