* windows: fix config, IPC, path, and Lua compatibility
* spotify: share API structures and helper so tests compile on Windows
* windows: address PR comments and fix socket unavailable detection, tasklist matching, api_fs tests, and doc comment
* windows: address remaining PR reviews (table-driven tests, m3u resolve comments & tests, blockquote formatting, and site/index.html description)
* feat: implement cross-platform IPC server with Unix and Windows support
* feat: implement Unix socket IPC server and Windows process liveness check
* ipc: detect dead processes via os.ErrProcessDone
os.Process.Signal converts ESRCH to os.ErrProcessDone since Go 1.16, so
comparing against raw syscall.ESRCH never matched and a stale socket from
a crashed instance made NewServer fail instead of cleaning it up.
* windows: simplify fs allowlist normalization, exec env, and ipc error checks
- normalize write allow-dirs once in the memoized writeAllowDirs
- collapse duplicate test helpers and repeated getenv blocks
- drop redundant errors.As branch; name WSAECONNREFUSED
- revert single-entry table test to linear form
- gofmt: trailing newlines and indentation
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Co-authored-by: Bjarne Øverli <bjarne.oeverli@gmail.com>
Bjarne Øverli