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21f93c16c7
Add CopilotCliBackend that drives the GitHub Copilot CLI in non-interactive mode (copilot -p ... --output-format json) and parses the JSONL event stream for assistant.message content. Registered as the 'copilot' backend (with aliases) and wired through the CLI, config, experiment harness, and the Copilot MCP server's backend enum. - Force UTF-8 decoding of CLI output (fixes cp1252 UnicodeDecodeError on Windows when responses contain non-cp1252 bytes). - Minimise per-call startup: isolated COPILOT_HOME with built-in MCPs and custom instructions disabled, so user MCP servers are not spawned per call (~5x faster: 36s -> 7.4s). Override via SKILLOPT_SLEEP_COPILOT_HOME / SKILLOPT_SLEEP_COPILOT_MODEL / SKILLOPT_SLEEP_COPILOT_FULL_ENV. Validated end-to-end on real held-out tasks (researcher persona: 0.42 -> 1.00 lift; gate correctly rejects non-improving edits). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>