feat: gated project experience & prompt intelligence

Implements the full gated session flow and prompt intelligence system:

- Prisma schema: add gated, priority, summary, chapters, linkTarget fields
- Session gate: state machine (gated → begin_session → ungated) with LLM-powered
  tool selection based on prompt index
- Tag matcher: intelligent prompt-to-tool matching with project/server/action tags
- LLM selector: tiered provider selection (fast for gating, heavy for complex tasks)
- Link resolver: cross-project MCP resource references (project/server:uri format)
- Prompt summary service: LLM-generated summaries and chapter extraction
- System project bootstrap: ensures default project exists on startup
- Structural link health checks: enrichWithLinkStatus on prompt GET endpoints
- CLI: create prompt --priority/--link, create project --gated/--no-gated,
  describe project shows prompts section, get prompts shows PRI/LINK/STATUS
- Apply/edit: priority, linkTarget, gated fields supported
- Shell completions: fish updated with new flags
- 1,253 tests passing across all packages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcpd/tests/project-routes.test.ts

@@ -16,6 +16,7 @@ function makeProject(overrides: Partial<ProjectWithRelations> = {}): ProjectWith
     description: '',
     ownerId: 'user-1',
     proxyMode: 'direct',
+    gated: true,
     llmProvider: null,
     llmModel: null,
     version: 1,