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P1 of the `mosaic yolo claudex` launcher (#790): pure, dependency-injected preflight and lifecycle helpers for `raine/claude-code-proxy` (the local Anthropic->Codex translation proxy on 127.0.0.1:18765). No session launch yet; the isolated CLAUDE_CONFIG_DIR composition + env-injection land in PR-2. Authored test-first (spec written and run red before implementation, then green). 39 unit tests, 89.6% statement/line coverage on the new module; the only uncovered lines are the process-spawning system wrappers (systemd/nohup/wait), which are integration glue unsuitable for unit spawning. Helpers: - checkProxyBinary — binary presence via an injectable `which` resolver. - parseAuthStatus / checkAuthStatus — coarse OAuth state from `codex auth status`. Carries NO token material (state + optional expiry only) so token-shaped output can never leak downstream. - runDeviceReauth — `codex auth device` with stdio:'inherit' so the device code streams to the user's TTY; the launcher never captures/logs it or sees the resulting token. - probeLiveness — gotcha #1: ANY HTTP response (incl. non-2xx) = alive; only a transport failure/timeout = dead. NEVER `curl -f` (that spawned duplicate proxies). Bounded by an explicit timeout race so a hung socket can't wedge. - buildSystemdUnitContent / systemdUnitPath / installSystemdUnit — systemd --user unit management; unit carries no credential material. - runProxyPreflight — structured binary+auth+liveness report. - ensureProxyRunning — no-op when live, else systemd-preferred with nohup fallback, re-probing after each attempt so it never spawns a duplicate. Refs #790. Not part of the #758 fleet DAG. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>