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* fix(daemon): let the daemon own its pidfile, so stop can stop it `bdrive stop` could fail with "no such process" and leave sync running. Liveness became the flock in #88, and Run already announces the child's own pid only after it holds that lock. But Start still wrote daemon.pid from the parent, right after fork, with the pid of a child that had not earned anything yet. Two starts inside that window — `bdrive init` followed by the login agent's `bdrive resume`, or two resumes close together — race: Running still reads false, a second child spawns, it loses hold(), and it exits without ever being the daemon. Its pid is already in the file. Everything downstream trusts that file. Stop signals the loser and gets ESRCH, so it reports failure while the winner keeps syncing — the one command whose job is "stop sending my files" silently does not. status prints the phantom pid, or "pid 0" when the loser's cleanup removed the file the winner wrote. So the parent no longer writes it: the pidfile belongs to whoever holds the lock. Start now waits for the lock to be taken instead of assuming the spawn worked, which also means a caller that gets a pid back can trust a daemon owns it — `bdrive resume` used to print "started (pid N)" for a child that had already died. The regression test needs the real binary (Start execs os.Executable), so it lives with the CLI e2e rather than in internal/daemon, whose tests synthesize locks. It is deterministic on Linux and roughly one run in five on macOS, where the window is tighter; `sandbox/run.sh daemon-linux` is the reliable reproducer. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DgF8JsoeNPVShGYWdooE72 * docs(architecture): the daemon owns its pidfile, Start only waits for the lock Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DgF8JsoeNPVShGYWdooE72 --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>