fix(dev): restore tsconfig and fix tsx resolution for dev scripts

[evanjacobson]

Summary

After the monorepo restructure (#1315), pnpm dev:start fails because tsx can't find a tsconfig when running dev scripts from the repo root — the root tsconfig.json and tsconfig.scripts.json were moved to apps/web/ without replacements.

This adds a minimal root tsconfig.json scoped to dev/**/* and scripts/**/*, plus a tsconfig.scripts.json alias for backward compatibility. It also fixes two related issues:

• Bare tsx unreachable in tmux — commands sent into tmux panes used bare tsx, which isn't on PATH without pnpm's node_modules/.bin augmentation. Changed to pnpm exec tsx.
• Stale docker-compose paths in kiloclaw — dev-start.sh still referenced the pre-restructure apps/web/dev/docker-compose.yml path instead of dev/docker-compose.yml.

Verification

• pnpm typecheck passes
• pnpm exec tsx dev/local/dashboard.tsx runs successfully with core and kiloclaw services
• pnpm dev:start / pnpm dev:stop lifecycle works

Visual Changes

N/A

Reviewer Notes

The root tsconfig.scripts.json exists because tsx caches the tsconfig filename in the TSX_TSCONFIG_PATH env var, which can persist across tmux sessions from before the restructure. It's a one-line extends — zero maintenance cost.