DarkExec v0.1.0-alpha

First public self-hosted Linux alpha. Ships pinned Harness Ops commit f509314ff715adb4b765f350fb5be78acacbff54 with SHA-256 b336f6d8e9abcf27c60ccbee83d31bfb92310b27c3ae9dd789662eaded20d5a4. Qualified through exact running Codex App visibility, verbatim read-only target execution, same-task harness closeout, terminal receipt, clean-clone installation, and deterministic signal terminalization. See README for prerequisites and alpha limitations.