docs(agent-browser): repoint stale Source-of-truth pointers to the surface controller

[dormouse-bot]

Three Source of truth: parentheticals in dor-browser.md still credit AgentBrowserPanel.tsx for logic that moved into agent-browser-surface-controller.ts when the panel was reduced to a thin view. The controller's own header comment now claims these responsibilities ("connection + screenshot loop, viewport-sync state machine, pop-out/pop-in orchestration + auto-revert, CDP observer, canonical-URL tracking"), and the spec's own Agent-Browser Connection section already credits the controller — so these three pointers were internally contradictory and out of date.

Repointed to the controller:

• rememberRestorableUrl / URL mirror (§Render Modes) — now agent-browser-surface-controller.ts:rememberRestorableUrl.
• screenActions, sync effects, pop-out/pop-in (§Display swaps) — screenActions/popOut/popIn live in the controller.
• pop-out state, CDP observer, auto-revert (§Pop-out) — CDP observer and maybeAutoRevert live in the controller.

Left untouched: AgentBrowserPanel.tsx references that are still accurate — the panel remains the renderer view (toDevice coordinate mapping, input handlers, DOM focus) and is correctly listed as the agent-browser renderer elsewhere in the spec.

Verified: each moved symbol grep-confirmed absent from AgentBrowserPanel.tsx and present in agent-browser-surface-controller.ts; pnpm lint:specs passes. Docs-only, no test.

Found during the nightly code-quality survey.

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