Point links at the extant2000 GitLab group

The messenger repositories move from gitlab.com/paulhitt to
gitlab.com/extant2000. Old web and git URLs redirect; the relay's container
image path does not, so docker-compose.yml names the new registry path.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.e2e-ref.md

@@ -1,6 +1,6 @@
 # Why this repository pins flamenet-e2e
 
-`.e2e-ref` is the commit of [flamenet-e2e](https://gitlab.com/paulhitt/flamenet-e2e)
+`.e2e-ref` is the commit of [flamenet-e2e](https://gitlab.com/extant2000/flamenet-e2e)
 whose protocol vectors the `unit-tests` job checks against. `AccountKdfTest`,
 `PQVectorTest` and `PublishedVectorsTest` all read them.
 

.gitlab-ci.yml

@@ -73,7 +73,7 @@ unit-tests:
     # `flamenet-e2e` is public, so no credentials are needed.
     - FLAMENET_E2E_PIN=$(cat "$CI_PROJECT_DIR/.e2e-ref")
     - rm -rf "$CI_PROJECT_DIR/.ci-vectors"
-    - git clone -q https://gitlab.com/paulhitt/flamenet-e2e.git "$CI_PROJECT_DIR/.ci-vectors"
+    - git clone -q https://gitlab.com/extant2000/flamenet-e2e.git "$CI_PROJECT_DIR/.ci-vectors"
     - git -C "$CI_PROJECT_DIR/.ci-vectors" checkout -q "$FLAMENET_E2E_PIN"
     - export FLAMENET_VECTORS="$CI_PROJECT_DIR/.ci-vectors/test/vectors/protocol-v1.json"
     - export FLAMENET_PQ_VECTORS="$CI_PROJECT_DIR/.ci-vectors/test/vectors/pqx3dh-v2.json"
@@ -195,7 +195,7 @@ vectors-head:
     - export JAVA_HOME=/opt/homebrew/opt/openjdk@21
     - export ANDROID_HOME=$HOME/Library/Android/sdk
     - rm -rf "$CI_PROJECT_DIR/.ci-vectors-head"
-    - git clone --depth 1 https://gitlab.com/paulhitt/flamenet-e2e.git "$CI_PROJECT_DIR/.ci-vectors-head"
+    - git clone --depth 1 https://gitlab.com/extant2000/flamenet-e2e.git "$CI_PROJECT_DIR/.ci-vectors-head"
     - |
       echo "pinned:  $(cat "$CI_PROJECT_DIR/.e2e-ref")"
       echo "at HEAD: $(git -C "$CI_PROJECT_DIR/.ci-vectors-head" rev-parse HEAD)"

README.md

@@ -47,7 +47,7 @@ less than the two existing engines quietly agreed on, but only if it is
 written against the spec and the published vectors rather than against a
 reading of our own Swift and JavaScript. So the engine is held to
 `test/vectors/protocol-v1.json` in
-[flamenet-e2e](https://gitlab.com/paulhitt/flamenet-e2e), the same file the
+[flamenet-e2e](https://gitlab.com/extant2000/flamenet-e2e), the same file the
 other two engines are checked against, read from that repository rather than
 copied here, because a copied vector file drifts and a drifting vector file
 stops being a check. `PublishedVectorsTest` looks for it beside this checkout

engine/src/test/kotlin/io/flamenet/e2e/PublishedVectorsTest.kt

@@ -30,7 +30,7 @@ class PublishedVectorsTest {
             file != null,
             "published vectors not found. Looked in: " +
                 candidates.joinToString(", ") { it.absolutePath } +
-                ". Clone https://gitlab.com/paulhitt/flamenet-e2e beside this repo, " +
+                ". Clone https://gitlab.com/extant2000/flamenet-e2e beside this repo, " +
                 "or set FLAMENET_VECTORS to protocol-v1.json.",
         )
         JSONObject(file!!.readText())