v0.2.0: broaden tools, ship neovim MCP server, namespace agent

- agents/companion.md: expand tools to full editor + filesystem + web set
  and grant mcp__neovim__* so the agent can drive nvim directly
- skills/*: each skill's allowed-tools also gains mcp__neovim__*
- .mcp.json: ship the mcp-neovim-server config with the plugin so
  installing the plugin auto-wires the editor MCP (uses default socket
  /run/user/1000/nvim.sock — adjust if your uid differs)

skills/claude-code-handoff/SKILL.md

@@ -12,7 +12,7 @@ description: |
   buffer", "have Claude edit my file", "send this to Claude in nvim",
   "let Claude in the editor handle it".
 disable-model-invocation: false
-allowed-tools: Bash, Read, Skill, AskUserQuestion
+allowed-tools: Bash, Read, Skill, AskUserQuestion, mcp__neovim__*
 ---
 
 # claude-code-handoff — let the in-editor Claude do the editing

skills/editor-act/SKILL.md

@@ -12,7 +12,7 @@ description: |
   neo-tree", "run this command in my nvim", "go to next diagnostic",
   "save my buffer".
 disable-model-invocation: false
-allowed-tools: Bash, Read, Skill, AskUserQuestion
+allowed-tools: Bash, Read, Skill, AskUserQuestion, mcp__neovim__*
 ---
 
 # editor-act — do things in the user's nvim

skills/editor-introspect/SKILL.md

@@ -12,7 +12,7 @@ description: |
   "current selection", "what's the cursor on", "any diagnostics",
   "lualine theme actually applied".
 disable-model-invocation: false
-allowed-tools: Bash, Read
+allowed-tools: Bash, Read, Glob, Grep, mcp__neovim__*
 ---
 
 # editor-introspect — read the live nvim instance