[wrossmorrow-pi-bot]

What

Corrects stale ext_proc header names in the README examples section, aligning them with the
names now used by the SDK and the Go/Rust SDKs.

Changes

• x-extproc-started → x-extproc-started-ns (HTTP sample + JSON echo key)
• x-extproc-finished → x-extproc-finished-ns (HTTP sample)
• x-extproc-response-seen: true → x-extproc-response: seen (HTTP sample; aligned with the
  trivial example's x-extproc-response marker)
• X-Extproc-Request-Seen → X-Extproc-Request (JSON echo key; aligned with the trivial example)
• X-Extproc-Started → X-Extproc-Started-Ns (JSON echo key)
• x-extproc-processors → x-extproc-names (No-op prose; the SDK adds x-extproc-names)
• X-Echo-Delay → ?delay=<int> query param (Dedup prose; aligned with Go/Rust)
• example source path corrected to src/main/java/com/github/wrossmorrow/extproc/processors

Notes

• The missing router example/processor was verified to already exist, be wired into
  docker-compose.yaml/envoy.yaml, and be documented in the README, so no code change was needed
  there.

Verification

./gradlew clean build