Unify MCP across clients; remove legacy plugin server

docs/ai.md

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+# AI / Agent Documentation Index
+
+This repo also includes documentation intended for AI agents (Claude Code plugin skills/commands, internal reference docs, and knowledge base files).
+
+Key entry points:
+
+- `CLAUDE.md` — instructions for Claude Code sessions and MCP setup.
+- `admin-ui/AI-REFERENCE.md` — Admin UI architecture and API usage reference.
+- `dss-claude-plugin/commands/` — Claude Code slash commands (operator runbooks).
+- `dss-claude-plugin/skills/` — skill prompts for tool-using agents.
+- `.knowledge/` — internal knowledge base documents.
+
+## Cross-model (Claude, Codex, Gemini)
+
+The DSS MCP server is client-agnostic. For non-Claude clients, the Claude plugin system (slash commands) does not load, but:
+
+- the same MCP tools are available, and
+- the plugin guides can be discovered via MCP tools:
+  - `dss_list_guides`
+  - `dss_get_guide`
+  - `dss_match_skills` (emulates skill hook matching via `globs` / `alwaysApply`)