Adds docs/deployment.md, a platform-agnostic guide (any Linux host with
Docker) built around a git-pull based fast-redeploy workflow, replacing the
Proxmox-specific deploy/proxmox_llm_deploy.md which was also stale (old
`persona` field, single-shared-token model predating multi-user auth).
Also: drops the unused DAYBOOK_API_TOKEN from deploy/env.example, documents
the new DELETE endpoint and capabilities `methods` field in docs/api.md and
docs/agent_quickstart.md, and fixes CLAUDE.md's OpenCode note now that
opencode.json is untracked (machine-specific MCP config).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
