Split price quote from swap quote

[its-everdred]

Closes #435

Problem

actions.swap.getQuote(...) (no wallet bound) returned a SwapQuote whose
recipient: Address was the Universal Router msg.sender sentinel
(0x0000000000000000000000000000000000000001) when no recipient was supplied.
The type said "ready to execute" while the value was un-executable — a footgun
for any consumer reading quote.recipient for display, accounting, or analytics.

Change (Option B — split the type)

• New PriceQuote type: pricing, amounts, route, metadata only — no
  recipient, no execution. Structurally un-executable. SwapQuote now
  extends PriceQuote and adds execution, recipient, approvalMode.
• actions.swap.getQuote / getQuotes return PriceQuote (stripped at the
  namespace boundary via toPriceQuote). wallet.swap.getQuote / getQuotes
  still return the full SwapQuote; wallet.swap.execute is unchanged.
• BaseSwapNamespace.getQuote/getQuotes became protected resolveQuote/ resolveQuotes (a covariant override can't widen the return type), with each
  namespace exposing its own public method.
• Consumers updated: CLI printer + actions swap quote(s) commands, demo
  backend getQuote, demo frontend EarnOperations/useSwap/SwapAction/
  actionsApi.

Providers are untouched — the sentinel remains a valid internal Universal
Router encoding detail; it's simply never exposed.

Why B

The demo's executeSwap re-quotes from raw params via wallet.swap.execute
and never executes an actions-level quote, so the execution/recipient on a
price quote were already dead weight (and un-executable post-#434). Dropping
them breaks no execution path and gives price-display consumers a smaller,
honest surface.

Note: passing a PriceQuote to execute is structurally accepted as raw
params, but it carries quotedAt, so it routes to the pre-built-quote path and
throws on the missing recipient — a fail-loud runtime guard (regression-tested).

Testing

• SDK 666, CLI 261, demo backend 130, demo frontend 73, contracts 18 — all green.
• New tests: actions.swap.getQuote strips recipient/execution/approvalMode
  (the leak fix); execute rejects a price-only quote.
• Manual CLI verification: actions swap quote (live, base-sepolia) JSON output
  contains no recipient/execution/sentinel; human output renders cleanly.
• pnpm typecheck && pnpm lint && pnpm test clean (zero new warnings).
• Changeset added (minor; breaking type change documented).

Plan: docs/plans/2026-06-16-001-refactor-split-price-quote-from-swap-quote-plan.md.

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