feat(mcp): add debug logging mode for tool calls and errors

[annextuckner]

What

Adds a debug logging mode that surfaces tool calls and error responses live in the terminal.

pnpm run server-http:debug     # HTTP mode + debug logging
pnpm run server-stdio:debug    # stdio mode + debug logging
# or set MCP_DEBUG=true / LOG_LEVEL=debug on the existing server-* scripts

• lib/logger.ts — log level is now env-driven (MCP_DEBUG / LOG_LEVEL). Adds a pino-pretty stderr target. Errors surface to the terminal in normal runs; the full request/response stream shows when debug is on. The tmp log files still capture everything. stderr is safe in both modes — it is never the MCP protocol channel.
• lib/tool-logging.ts (new) — withToolLogging() wraps registerTool once so every tool logs uniformly: args and successful responses at debug level, error responses and thrown errors always. The access token rides on extra.authInfo and is never logged.
• lib/depscore-tool.ts — apply the wrapper in createConfiguredServer, the shared factory for both transports.
• package.json — server-http:debug / server-stdio:debug scripts.

Stacked

Based on #179 (the MCP tools PR) since both edit createConfiguredServer. Retarget to main once #179 merges.

Test

• pnpm run test:node-test — 77 tests pass
• oxlint clean on the changed files; tsgo clean on lib/
• Verified both modes by hand: debug mode prints tool call / tool result; normal mode prints only error responses to stderr