v0.5.0

This release brings the read-only analysis tooling out of the terminal and into
the local dashboard, and gives the docs pages a proper visual pass.

Dashboard: read-only analysis panels

The proxy wire report and the analyze / optimize / stats reports were
CLI-only. They now render in the embedded, token-gated dashboard — no new
mutating routes, so --read-only mode stays fully enforced (and pinned by the
route-matrix test).

• Proxy tab — the wire lens, the same ranked report as agentstack proxy report: per-turn tools and token weight, plus a per-capability table (tools,
  average tokens/turn, calls, and a drop / lazy · keep · watch hint). An
  explicit empty state points at agentstack proxy start when there's no
  telemetry yet.
• Insights tab — three stacked read-only reports: Optimize (each
  recommendation with its evidence, exact command/TOML, and why it's safe or
  needs a human), Analyze (runtime call activity from the gateway audit log
  plus library dead weight), and Stats (per-capability activations, measured
  context cost, live slots, and dead-weight flags).
• The snapshot collectors are best-effort: a failing report degrades to an empty
  panel instead of sinking the whole dashboard. The optimize and stats
  report logic was extracted into shared pure helpers so the CLI and the
  dashboard can never drift.

Observe-only wire proxy

• agentstack proxy stands up a loopback proxy in front of the Anthropic API
  and relays every request verbatim — nothing injected, the tools/system block
  is never touched, so the prompt-prefix cache stays warm. As requests flow it
  accounts what the tools block costs per turn and stashes best-effort
  per-capability numbers. proxy report ranks it into the ground-truth
  companion to the static stats estimate.

Doctor

• doctor now warns on bare, PATH-dependent stdio launchers — a server that
  will break the moment it's spawned from a different environment.

Docs

The landing and central-library pages got a self-contained visual refresh —
sticky blurred nav, a bolder hero, terminal showpieces, a proof row of all 13
supported CLIs, and a feature-card grid — with light and dark both tuned and no
external assets. The dashboard guide documents the new Proxy and Insights panels.