Release 2026.7.1

Add — first public release

• DevTools panel (Chrome/Chromium/Edge ≥116, Firefox ≥128) that
  live-captures the inspected page's fastmon collector beacons, groups them by
  pageview (pvid), and shows how the data evolves across beacon versions
  and lifecycle states (init → loaded → hidden/frozen/terminated /
  softnav / *_update).
• Reliable terminal-beacon capture. Terminal beacons are sent via
  navigator.sendBeacon, whose body neither the DevTools/HAR API nor
  chrome.webRequest exposes for ping requests. A MAIN-world content script
  wraps sendBeacon in the page, relays each payload to the service worker via
  a synchronous CustomEvent, and the SW parks it in chrome.storage.session
  (keyed by tab id) for the panel to drain — so the closing beacon is no longer
  lost and pageviews finalise instead of stalling at loaded / live.
• Merged-state-first view. The detail pane shows the current merged state by
  default; a "show versions" toggle expands the per-beacon-version diff
  (yellow = changed vs. the previous version). Core Web Vitals are rated
  good / needs-improvement / poor by the web.dev thresholds.
• Session overview dashboard, compare mode, soft-navigation
  detection, inline charts (lifecycle timeline, navigation waterfall, vitals
  subparts), a field search, and Markdown export (raw or anonymised for
  pasting into an AI assistant).
• Wire-contract drift guard (tests/decode-map.test.js) that checks the
  decode map against the collector's CompactBeacon model when the backend
  source is available (FASTMON_COLLECTOR_PY), and skips gracefully otherwise.