feat: MCP tools for initGuided and checkIssues

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User story

An AI agent initializes a dotdog project or audits issue coverage without
running CLI commands. Two new MCP tools expose the same features.

New tools

initGuided — non-interactive project init from parameters

{ name: 'initGuided',
  description: 'Initialize a dotdog project from parameters',
  inputSchema: { properties: {
    project: { type:'string' },
    purpose: { type:'string' }, 
    users: { type:'string' },
    rules: { type:'string' },
    entities: { type:'string' }
  }, required: ['project'] } }

checkIssues — validate spec coverage against GitHub issues

{ name: 'checkIssues',
  description: 'Validate spec coverage against GitHub issues',
  inputSchema: { properties: {
    repo: { type:'string' },
    project: { type:'string' }
  }, required: ['repo'] } }

Implementation

• Add tool defs to tools/list handler in serve.ts
• Add handlers in tools/call — reuse logic from CLI
• Extract shared initProject() and checkIssues() from cli.ts

Scope

• 2 new MCP tool definitions
• 2 new if-blocks in tools/call handler
• ~30 lines in serve.ts, ~10 line refactor in cli.ts
• Zero new files, zero new deps

Depends on: init --guided, issues --check