feat/2-process-manager
- actor ProcessManager: runStreaming + runCaptured (concurrent pipe drain — no 64 KiB deadlock), sendStdin with independent stdin map (#84), kill/killAll, duplicate-id rejection (#116) - Multicast AsyncStream<ProcessEvent> bus: stdout/stderr/exit/error/ jsonRow (ROW_COLORS_JSON: prefix stripped) - exit emitted exactly once, gated on both pipes reaching EOF so buffered output is never lost on fast exits or kills - ARGYLL_NOT_INTERACTIVE=1 on every child; argv logged with ~ home sanitization; subprocess stdout→info, stderr→warn - ProcessLineDecoder (byte-split at \n, UTF-8 safe, CRLF, unterminated tail flush), JSONAccumulator (multiline JSON for instlist/profcheck/ manifest), ProcessID conventions - 19 new tests incl. large-output captured run and stdin round-trip - Fixup: entitlements gain com.apple.security.device.usb; sidebar preset/Calibrate disabled and only Stage 1 enabled per #1 AC Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>