Prepend .kamal/bin to PATH during hook execution

[jeremy]

Summary

• Hooks can now call executables in .kamal/bin without qualification
• .kamal/bin is prepended to $PATH inside with_env, which wraps every hook execution
• PATH is restored after each hook via the existing ensure block
• Same pattern as npm prepending node_modules/.bin for scripts

Stacked on #1784 (external commands).

Example

# .kamal/hooks/post-configure can now call:
claims release beta3

# instead of:
.kamal/bin/claims release beta3

Test plan

• .kamal/bin is prepended to PATH when directory exists
• PATH is unchanged when .kamal/bin is absent
• PATH is restored after with_env returns

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[Copilot]

Pull request overview

This PR enables hooks to call executables in .kamal/bin without needing to qualify the path, by prepending .kamal/bin to the PATH environment variable during hook execution. This builds on PR #1784 which added support for git-style external commands.

Changes:

• Modified with_env method to automatically prepend .kamal/bin to PATH when the directory exists
• Added prepend_kamal_bin_to_path helper method to handle the PATH modification
• Added comprehensive test coverage for PATH manipulation during hook execution

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lib/kamal/cli/base.rb	Added prepend_kamal_bin_to_path method and integrated it into with_env to prepend .kamal/bin to PATH during hook execution
test/cli/main_test.rb	Added tests verifying PATH is correctly prepended when .kamal/bin exists and unchanged when absent, plus PATH restoration after hook execution

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