Summary

• New "Detected on this page" section in the browser-action popup that lists what roach-motel-annotate and webdriver-probe-annotate flagged on the active tab.
• Toolbar badge tints amber on tabs with detections; shows ! when there's no placeholder count to anchor on, otherwise keeps the existing count text.
• Detections clear on navigation, tab close, and when the user toggles the producing rule off mid-session.

Why

Today both rules surface their findings only as sr-only landmarks in the accessibility tree — readable to agents but invisible to sighted users. The popup had no per-tab activity view and the badge only counted placeholders, so a roach-motel hit or a navigator.webdriver read on the current page produced zero human-visible signal.

Approach

• Each rule emits a typed rule-detection message right after stamping its landmark. The existing landmark-presence short-circuits double as per-document dedupe latches, so no separate flag is needed.
• background.ts keeps a Map<tabId, Map<DetectionKind, DetectionPayload>> alongside the existing tabCounts map. A unified refreshBadge(tabId) reads both signals and picks color + text. Detections are cleared on tabs.onUpdated status: "loading", tabs.onRemoved, enforcement-off, and rule-disable transitions via ruleStatesStorage.subscribe.
• The popup queries the background once on mount via a get-tab-detections message; the hook stays null until the runtime fetch resolves so the empty state doesn't flash on tabs that actually have detections.
• No new permissions required. Page DOM is untouched, which keeps hidden-text-strip and CSP-strict sites out of the picture.

Out of scope

• Promoting tabDetections to chrome.storage.session so SW restarts don't lose state (in-memory matches tabCounts posture today).
• Surfacing detections via the on-page floating shield button.

Test plan

• bun run typecheck, bun run check, bun run knip, bun run build, bun run test (1005 tests pass).
• Load unpacked from extension/dist, visit https://www.nytimes.com/subscription/all-access, open popup → roach-motel entry appears with host, difficulty, cancellation link, source; badge is amber.
• Toggle roach-motel-annotate off → entry disappears; badge reverts to blue (or empty) when there's no placeholder count.
• Toggle webdriver-probe-annotate on, reload a probing page → webdriver-probe entry appears.
• Navigate the same tab elsewhere → detections clear.
• Close the tab → background drops the entry (verify via SW console).

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