feat: switch to Pino logger with per-request context

[xmtp-coder-agent]

Resolves #63

Summary

• Replace custom ConsoleLogger with Pino — createLogger() factory returns a Pino-backed logger that adapts Pino's (fields, msg) API to the codebase's (msg, fields?) convention
• LOG_FORMAT=json env var — JSON output in production, pino-pretty for local dev (default)
• Per-request child loggers — Each webhook request gets a child logger with requestId, deliveryId, eventName bound as context, propagated through the dispatcher to all handlers
• Interface update — warning() → warn() (Pino convention), child(bindings) method added to Logger interface
• TestLogger preserved — Updated with child() support; child loggers share the parent's messages array for easy assertions

Files changed

File	Change
src/logger.ts	Pino-backed createLogger(), updated Logger interface, updated TestLogger
src/config.ts	Added logFormat field (from LOG_FORMAT env var)
src/main.ts	Use createLogger(), pass per-request logger through callback
src/server.ts	Create per-request child logger with requestId/deliveryId/eventName, pass to handleWebhook
src/handler-dispatcher.ts	Accept optional per-request logger in dispatch()
src/handlers/close-task.ts	warning() → warn()
src/handlers/pr-comment.ts	warning() → warn()
src/github-client.ts	warning() → warn()
src/task-utils.ts	warning() → warn()
package.json	Added pino and pino-pretty dependencies

Test plan

• All 181 existing tests pass
• New test: per-request child logger includes requestId, deliveryId, eventName
• New tests: TestLogger.child() shares messages array, merges bindings
• New tests: createLogger() returns logger with all methods including child()
• bun run check passes (typecheck + lint + format + test)

Note

Switch logger to Pino with per-request child loggers bound to delivery ID and event name

• Replaces ConsoleLogger with a Pino-backed createLogger factory in src/logger.ts; supports JSON or pretty-print output via the LOG_FORMAT env var.
• Adds a child() method to the Logger interface; src/server.ts creates a per-request child logger pre-bound with deliveryId and eventName for structured log correlation.
• Passes the per-request logger through HandlerDispatcher.dispatch and all downstream handler constructors so every log line carries request context.
• Renames warning() to warn() across all handlers and test helpers to align with the Pino API.
• Behavioral Change: pino and pino-pretty are excluded from the bundled output and must be present as runtime dependencies; LOG_FORMAT=json selects structured output, otherwise pretty-print is used.

^{Macroscope summarized c6d3aa6.}

[neekolas]

Uh oh. CI is failing

[neekolas]

This file should be gitignored and removed from the repo

[neekolas]

Why didn't you respond to this?

[xmtp-coder-agent]

You're right — removed dist/server.js from the repo, added dist/ to .gitignore, and removed the "verify dist is up to date" CI step. The Dockerfile already builds dist at container build time so it was never needed in the repo.

[neekolas]

You should be able to get this from the webhook somewhere

[xmtp-coder-agent]

Good call — the X-GitHub-Delivery header already uniquely identifies each webhook request. Replaced the crypto.randomUUID() with deliveryId from the header. The child logger now binds deliveryId and eventName as context.