Adds lifecycle control for managed local LLM providers (vllm-managed)
without the nuclear option of restarting mcplocal. Practical use:
mcpctl provider vllm-local down # release GPU memory now
mcpctl provider vllm-local up # warm up before the next chat
mcpctl provider vllm-local status # see state, pid, uptime
mcplocal exposes three new endpoints:
GET /llm/providers/:name/status → returns lifecycle state for
managed providers, { managed: false }
for unmanaged (anthropic, openai, …)
POST /llm/providers/:name/start → calls warmup() (202 + initial state)
POST /llm/providers/:name/stop → calls dispose() (200 + post-stop state)
Stop and start return 400 for non-managed providers — stopping an API-key
provider is meaningless. The CLI surfaces the error verbatim.
Restarting mcplocal would also free the GPU but drops the SSE connection
to mcpd and forces every virtual Llm to re-publish; this is the targeted,
non-disruptive escape hatch.
The completions test gained a `topLevelMarkers` filter so a sub-command
named `status` (under `provider`) doesn't trip the existing "non-project
commands must guard with __mcpctl_has_project" rule.
Tests: cli 437/437, mcplocal 731/731.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
