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Dominic Anaeto
0f59ccef40
Opening an archived agent's timeline resumes its provider for history. Pi's resumeSession never received the resume purpose, so it launched the Pi RPC process, and its MCP support probe, in the agent's stored working directory. When that folder had been removed, for example with a merged worktree, Node failed the spawn with "spawn <command> ENOENT" and the history could not be read. Starting the process elsewhere is not enough: with --session, Pi checks the cwd stored in the session file's header and, outside interactive mode, exits when that folder is missing. A history resume whose stored folder is no longer a directory now starts Pi from the home directory on a temporary copy of the session file whose header names that directory. The copy streams everything after the header unchanged and is deleted when the session closes. The agent keeps reporting its stored folder and original session file, and the original file is not written to. The directory check moves out of the ACP provider, which already starts history loads from the home directory (#6228), into a shared helper both providers use. Fixes #7969