feat(extension): content script parser + session manager (Week 2 AC 2+3)

[BODMAT]

Implements page metadata collection and session lifecycle management in the extension.

What's included

AC 2 — Content Script

• Parses url, title, metaDescription, headings (h1–h3) from active page
• Fires on page load + SPA navigation (popstate, hashchange)
• Sends PAGE_METADATA to service worker; ignored if no active session

AC 3 — Session Manager

• startSession / stopSession with chrome.storage.local persistence
• Timer derived from startedAt + totalActiveMs — safe after SW restart
• Message handlers: SESSION_START, SESSION_STOP, SESSION_GET_STATE
• pendingEvents accumulation in storage (consumed by AC 5)

Gaps identified (documented in plan, resolved in AC 4/5)

• SESSION_PAUSE / SESSION_RESUME missing → added in AC 4
• No POST /api/v1/sessions endpoint → added in AC 5
• Notes from popup stored as Event with tags: ["note"]
• Event.content format defined: [metaDescription, ...headings].join(" | ")

Closes Week 2 AC 2, AC 3

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Project	Deployment	Actions	Updated (UTC)
worktrace	Ready	Preview, Comment	May 21, 2026 9:22pm