Lease lanes for the tail, a mixed lease order, coordinator:status, the edge end to end

A group now has two lease lanes (migration 6600): `history` works the ranges the bounds hand out, `tail` the tail
planner's, each with its own holder, window, snapshot and takeover redo, so a thread on the tail never wades
through a group's history and a held group's tail isn't stuck behind it. The edge puts `--tail-threads`
(EDGE_TAIL_THREADS, 1 of 2+ by default) of its threads on the tail lane; the group routes take `?lane=`. The
lease order within a lane alternates the group with the most planned articles and the longest unheld one. The
takeover redo puts back only the lane's ranges the window did after the snapshot, and a group whose last range
is held by a holder gone quiet can be taken over.

`coordinator:status` prints the catalog's room, the ranges by band, the last hour's rates, the held groups with
their snapshots and the phase-2 backlogs. `tests/e2e` runs the real edge-node binary against the node API: the
corpus-fill race, a failed stream and the restart that restores the snapshot, a restart without the snapshot
file, a takeover (STREAM_CHUNK_WAIT_MINUTES is a setting now). CI builds the binary before the tests.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -59,35 +59,28 @@ jobs:
           node-version-file: .nvmrc
           cache: npm
       - run: npm ci
+      - name: Rust toolchain
+        run: |
+          command -v cargo || curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
+          echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
+      # The edge worker (edge/, Rust): built first, since the e2e suite runs edge/target/release/edge-node against
+      # the node API; then its own tests, and the Rust and TypeScript RangeIndexers compared on the committed
+      # captures (edge/fixtures).
+      - name: Build the edge worker
+        run: cargo build --release --manifest-path edge/Cargo.toml --bin edge-node
       - name: Type check
         run: npx tsc --noEmit
       - name: Migrate
         run: node ace migration:run --force
       - name: Test
         run: node ace test
-
-  # The edge worker (edge/, Rust): its tests, and the Rust and TypeScript
-  # RangeIndexers compared on the committed captures (edge/fixtures).
-  edge:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with:
-          node-version-file: .nvmrc
-          cache: npm
-      - run: npm ci
-      - name: Rust toolchain
-        run: |
-          command -v cargo || curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
-          echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
       - name: cargo test
         run: cargo test --release --manifest-path edge/Cargo.toml
       - name: The Rust indexer over the fixtures
         run: edge/bench-fixtures.sh
 
   deploy:
-    needs: [test, edge]
+    needs: [test]
     if: github.ref == 'refs/heads/rebuild'
     runs-on: ubuntu-latest
     steps: