feat: add config validation and send dry-run

docs/refactor/plan.md

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+# Refactor Roadmap (2025-11-25)
+
+This is a living note capturing the cleanups underway to keep `warelay` small and maintainable.
+
+## Goals
+- Keep `src/index.ts` thin (<150 LOC) and treat it purely as the CLI entry/export surface.
+- Encapsulate infra helpers (ports, binaries, tailscale) and provider-specific code behind small modules.
+- Harden configuration validation and logging so users get actionable errors.
+- Improve UX for experimenting (dry‑run) without hitting Twilio or WhatsApp.
+
+## Completed
+- Extracted infra helpers into `src/infra/{ports,binaries,tailscale}.ts`.
+- Moved CLI dependency wiring into `src/cli/deps.ts`; `monitorWebProvider` now lives in `provider-web.ts`.
+- Added prompt/wait helpers (`src/cli/{prompt,wait}.ts`) and Twilio sender discovery module (`src/twilio/senders.ts`).
+- Slimmed `src/index.ts` to ~130 LOC.
+- README updated to document direct WhatsApp Web support and Claude output handling.
+
+## In this pass
+- Added config validation for inbound reply settings (claude output format, command/text shape).
+- Added `--dry-run` for `send` to print the outbound payload without contacting providers.
+- Documented roadmap (this file).
+
+## Next candidates (not yet done)
+- Centralize logging/verbosity (runtime-aware logger wrapper).
+- Provider barrels (`src/providers/twilio`, `src/providers/web`) to isolate imports further.
+- Webhook module grouping (`src/webhook/*`) to house server + Twilio update helpers.
+- Retry/backoff for webhook bring-up and monitor polling.
+- More unit tests for infra helpers (`ports`, `tailscale`) and CLI dep wiring.