docs: add Telemetry section linking to oss-telemetry opt-out docs

Discloses the single anonymous adoption ping sent on startup and points
users to the upstream README section for full opt-out instructions
instead of duplicating the table here.

README.md

@@ -490,6 +490,18 @@ make install  # Install locally
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
 
+## Telemetry
+
+On startup this binary sends a single anonymous adoption ping — project name,
+version, timestamp; no identifiers, no command output, no payload contents.
+Fire-and-forget with a 2-second timeout; cannot block startup or panic.
+
+See **[oss-telemetry — Disabling telemetry](https://github.com/lukaszraczylo/oss-telemetry#disabling-telemetry)**
+for the exact wire format, source, and full opt-out documentation.
+
+Quick opt-out: set any of `DO_NOT_TRACK=1`, `OSS_TELEMETRY_DISABLED=1`,
+or `KPORTAL_DISABLE_TELEMETRY=1`.
+
 ## License
 
 MIT License - see [LICENSE](LICENSE).