Comprehensive telemetry documentation covering:
- Why we collect (roadmap prioritization, filter quality, value measurement)
- How it works (daily ping, background thread, fire-and-forget)
- Every field with example values and purpose
- What is NOT collected (explicit exclusion list)
- Opt-out instructions
- Data handling and privacy guarantees
- Contributor guide for adding new fields
Link added from README.md privacy section.
Signed-off-by: Patrick szymkowiak <patrick.szymkowiak@innovtech.eu>