* fix(linux): add user bin directories to systemd service PATH
Fixes#1503
On Linux, the systemd service PATH was hardcoded to only include system
directories (/usr/local/bin, /usr/bin, /bin), causing binaries installed
via npm global with custom prefix or node version managers to not be found.
This adds common Linux user bin directories to the PATH:
- ~/.local/bin (XDG standard, pip, etc.)
- ~/.npm-global/bin (npm custom prefix)
- ~/bin (user's personal bin)
- Node version manager paths (nvm, fnm, volta, asdf)
- ~/.local/share/pnpm (pnpm global)
- ~/.bun/bin (Bun)
User directories are added before system directories so user-installed
binaries take precedence.
🤖 AI-assisted (Claude Opus 4.5 via Clawdbot)
📋 Testing: Existing unit tests pass (7/7)
* test: add comprehensive tests for Linux user bin directory resolution
- Add dedicated tests for resolveLinuxUserBinDirs() function
- Test path ordering (extraDirs > user dirs > system dirs)
- Test buildMinimalServicePath() with HOME set/unset
- Test platform-specific behavior (Linux vs macOS vs Windows)
Test count: 7 → 20 (+13 tests)
* test: add comprehensive tests for Linux user bin directory handling
- Test Linux user directories included when HOME is set
- Test Linux user directories excluded when HOME is missing
- Test path ordering (extraDirs > user dirs > system dirs)
- Test platform-specific behavior (Linux vs macOS vs Windows)
- Test buildMinimalServicePath() with HOME in env
Covers getMinimalServicePathParts() and buildMinimalServicePath()
for all Linux user bin directory edge cases.
Test count: 7 → 16 (+9 tests)
