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Neil
6954398d53
The packaged Windows `orca.exe` launcher read `ProcessStartInfo.EnvironmentVariables`, whose lazy getter copies the case-sensitive process block into a case-insensitive dictionary via `.Add`. An inherited block carrying both `PATH` and `Path` threw `ArgumentException: Item has already been added. Key in dictionary: 'PATH'`, so every `orca` invocation exited 1 before Electron started (native/windows-cli-launcher/OrcaCliLauncher.cs:46, printed at :67). The launcher now mutates its own environment with `Environment.SetEnvironmentVariable` and never touches either `ProcessStartInfo` env property, so `CreateProcess` passes a NULL environment block and the child inherits the live one verbatim. Orca was also minting the duplicate itself. `applyTerminalAttributionEnv` read `baseEnv.PATH` and unconditionally wrote `baseEnv.PATH`, so a Windows PTY that inherited `Path` got a second spelling; which one the child resolved was non-deterministic. `createLaunchEnv` did the same and, because its read always missed on Windows, shipped Agent Teams terminals a `PATH` containing only the tmux shim dir. `resolvePathEnvKey` (extracted from the existing precedent in windows-environment-path.ts) now drives every PATH read and write in the PTY env pipeline, and attribution collapses Windows onto the single OS-resolved spelling. Off Windows the resolver always returns `PATH`, so POSIX behavior is unchanged and a case-sensitive POSIX `Path` variable is never touched. Closes #12046