`src/content/tracking` — Ghost Tracking + Acceptance

These files belong together and implement the “runtime tracking” of suggestions on github.dev.

Modules

logging.js
- Captures visible ghost DOM elements and emits log_coordinates snapshots.
- Emits “empty snapshots” when we need to force-close a suggestion (e.g. focus loss).
acceptance.js
- Captures ghost text while visible.
- When ghosts disappear, compares captured ghost text against current editor text (near the top) and emits:
  - log_acceptance_check (per-anchor diagnostics)
  - log_acceptance (if any anchor matches)
observer.js
- Attaches a MutationObserver to the editor root.
- Filters to only react to mutations likely related to ghost suggestions (reduces overhead).
index.js
- “Facade” that wires the above together and exposes the stable NS.tracking.* API used by:
  - src/content/30_config.js (settings updates)
  - src/content/99_entry.js (startup timers + initial kick)