feat(mcp): trace, explore, and node MCP/HTTP tools (PR 6)

[SutuSebastian]

Summary

• Adds MCP/HTTP trace, explore, and node tools — thin composers over bundled call-path / symbol-neighborhood recipes plus budget-capped snippets (output-budget.ts, default 15k chars).
• Registers tools in mcp-server.ts, http-server.ts, and mcp-tool-allowlist.ts; updates MCP instructions + skill docs + architecture delivery tracker.

Dependency

Stacks on #133 (affected MCP tool). Merge #133 first, then rebase this branch onto main if the diff looks noisy.

Test plan

• bun test on output-budget, trace-engine, mcp-server, http-server test files
• bun run typecheck
• CI green on PR

[changeset-bot]

⚠️ No Changeset found

Latest commit: d346985

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Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f2d027d2-6eaf-48e4-909f-e5c6124bc5a5

📥 Commits

Reviewing files that changed from the base of the PR and between 386ffa6 and d346985.

📒 Files selected for processing (17)

• docs/architecture.md
• docs/plans/agent-surface-delivery.md
• docs/plans/mcp-trace-explore-tools.md
• docs/roadmap.md
• src/application/http-server.test.ts
• src/application/http-server.ts
• src/application/mcp-server.test.ts
• src/application/mcp-server.ts
• src/application/mcp-tool-allowlist.ts
• src/application/output-budget.test.ts
• src/application/output-budget.ts
• src/application/recipe-recency.ts
• src/application/tool-handlers.ts
• src/application/trace-engine.test.ts
• src/application/trace-engine.ts
• templates/agent-content/mcp-instructions.md
• templates/agent-content/skill/10-recipes-context.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/mcp-trace-tools

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