CLI DX: promote th up/th run as one-command local orchestration

[snissn]

Promotes a single orchestration command for local development while preserving backwards compatibility.

What changed

• Added th up as the primary all-in-one command for local flow.
• Added th run alias for the same orchestration command.
• Kept th dev as a compatibility alias.
• Updated command description to explicitly include faucet in the flow.
• Updated generated quickstart hint from th dev to th up.
• Updated root README quickstart from pnpm th dev ... to pnpm th up ....
• Expanded CLI tests to validate dry-run behavior for th up, th run, and th dev aliases.

Why

• Makes the CLI intent clearer: one command orchestrates build, deploy, preview, and faucet by default.
• Keeps existing scripts/docs from breaking while migrating users to the cleaner command surface.

Validation

• pnpm test (29 passing)