v0.7.0 — MCP self-attribution for partner-usage metrics

Headline: every comfy-cli invocation this server makes now self-attributes with COMFY_USER_AGENT=comfy-mcp (#163), so partner-API usage driven through the MCP becomes traceable server-side once comfy-cli's usage_source derivation (its PR #690) ships.

Also in this release (v0.5.0 → v0.7.0): install_node with per-call consent, workflow_deps, update-consent gating for target=all, the cancellable async runner on upload/deps paths, the gated untracked-server kill on restart, argv-length hardening, and the credential-URL masking fix in the failure log.