[The Framework] Persistent background dashboard process

[suleimansh]

Part of #299 (MVP slice 1 of 3). Rom greenlit cutting hard; building on the existing .framework/ store, LOGS.md deferred.

Today the dashboard (packages/framework/src/dashboard/) is per-run ephemeral: it dies when the run ends. Make $ framework (no prompt) ensure a persistent local process that serves the dashboard (localhost:4477) across runs, rehydrating from the existing store (.framework/events.jsonl + run.json).

Scope (MVP):

• $ framework with no prompt: ensure the background process is running; print convenience commands + version.
• Dashboard server runs standalone, rehydrates from the store, and stays up after a run finishes.
• One project = the cwd. No multi-project, no monorepo.

Done: run framework, the browser stays live showing the last/current run and survives the run ending.