CB-519: re-point pane assertions at the protocol-19 coordinate

Rebase integration only, no behaviour change. CB-519's tests named the pane the
pre-protocol-19 fake produced (w9:pW_n); upstream's herdr 0.8.0 port creates the
pane through tab.create and starts the agent into it, so the fake now reports
w9:pRoot_n. Five assertions were therefore counting closes of a pane that never
existed and reading 0.

mvn clean install: Tests run: 399, Failures: 0, Errors: 0 — BUILD SUCCESS

bridged/src/test/java/dev/ltms/bridged/herdr/FakeHerdr.java

@@ -84,7 +84,7 @@ public final class FakeHerdr implements HerdrClient {
 
     /**
      * Force the next {@code n} {@code agent.start} calls to report this terminal/pane coordinate,
-     * instead of the fake's usual incrementing {@code term_new_n}/{@code w9:pW_n}. Lets a test make
+     * instead of the fake's usual incrementing {@code term_new_n}/{@code w9:pRoot_n}. Lets a test make
      * two spawns report the <em>same</em> herdr pane, to prove the host-unique id (CB-519) never
      * collides on that coordinate.
      */

bridged/src/test/java/dev/ltms/bridged/session/SessionManagerTest.java

@@ -172,11 +172,11 @@ class SessionManagerTest {
         assertEquals(1, sessions.roster().size(), "only the fresh session remains");
         assertEquals(fresh.paneId(), sessions.roster().getFirst().paneId());
 
-        // The old session was the first spawn → pane w9:pW_1 (CB-519: the registry key is the
+        // The old session was the first spawn → pane w9:pRoot_1 (CB-519: the registry key is the
         // uuid id, so teardown is asserted on the real pane coordinate).
         long paneCloseCount = herdr.calls.stream()
                 .filter(c -> "pane.close".equals(c.method()))
-                .filter(c -> "w9:pW_1".equals(((Map<?, ?>) c.params()).get("pane_id")))
+                .filter(c -> "w9:pRoot_1".equals(((Map<?, ?>) c.params()).get("pane_id")))
                 .count();
         assertEquals(1, paneCloseCount, "the old worker was torn down");
     }
@@ -309,7 +309,7 @@ class SessionManagerTest {
         WorkerSession updated = sessions.get(session.paneId()).orElseThrow();
         assertEquals(WorkerSession.State.DONE, updated.state(), "session finishes second turn");
         assertEquals(2, updated.turnCount(), "turn count tracks both deliveries");
-        long releaseCloseCount = paneCloseCallsFor(herdr, "w9:pW_1"); // the real pane coordinate
+        long releaseCloseCount = paneCloseCallsFor(herdr, "w9:pRoot_1"); // the real pane coordinate
         assertEquals(0, releaseCloseCount, "cap disabled — no forced release of the worker pane");
     }
 
@@ -332,7 +332,7 @@ class SessionManagerTest {
 
         assertTrue(sessions.get(session.paneId()).isEmpty(), "session released after cap reached");
         assertTrue(sessions.roster().isEmpty(), "released session leaves roster");
-        assertEquals(1, paneCloseCallsFor(herdr, "w9:pW_1"),
+        assertEquals(1, paneCloseCallsFor(herdr, "w9:pRoot_1"),
                 "forced release tears the worker pane down exactly once");
     }
 
@@ -353,10 +353,10 @@ class SessionManagerTest {
         assertTrue(sessions.roster().isEmpty(), "drain clears the roster");
         assertTrue(sessions.get(ready.paneId()).isEmpty(), "ready session is released");
         assertTrue(sessions.get(busy.paneId()).isEmpty(), "busy session is released after timeout");
-        // ready is the first spawn → pane w9:pW_1, busy the second → w9:pW_2 (FakeHerdr order).
-        assertEquals(1, paneCloseCallsFor(herdr, "w9:pW_1"),
+        // ready is the first spawn → pane w9:pRoot_1, busy the second → w9:pRoot_2 (FakeHerdr order).
+        assertEquals(1, paneCloseCallsFor(herdr, "w9:pRoot_1"),
                 "ready worker pane is torn down");
-        assertEquals(1, paneCloseCallsFor(herdr, "w9:pW_2"),
+        assertEquals(1, paneCloseCallsFor(herdr, "w9:pRoot_2"),
                 "busy worker pane is torn down");
     }
 

bridged/src/test/java/dev/ltms/bridged/worker/ClaudeCodeLauncherTest.java

@@ -378,7 +378,7 @@ class ClaudeCodeLauncherTest {
     void stopResolvesTheHostUniqueIdToThePaneThatSpawnedIt() {
         // CB-519: id() != paneId, so stop(id) must tear down the exact pane the id names — and no
         // other live peer's pane.
-        FakeHerdr herdr = new FakeHerdr(); // deterministic panes w9:pW_1, w9:pW_2 per spawn
+        FakeHerdr herdr = new FakeHerdr(); // deterministic panes w9:pRoot_1, w9:pRoot_2 per spawn
         ClaudeCodeLauncher svc = service(herdr, List.of("ccs", "ltms-local"), null);
 
         PeerHandle a = svc.spawn(new SpawnRequest(null, null, null));
@@ -386,8 +386,8 @@ class ClaudeCodeLauncherTest {
 
         svc.stop(b.id());
 
-        assertEquals(1, paneCloseCount(herdr, "w9:pW_2"), "stop(b.id()) closes only b's pane");
-        assertEquals(0, paneCloseCount(herdr, "w9:pW_1"), "a's pane is untouched");
+        assertEquals(1, paneCloseCount(herdr, "w9:pRoot_2"), "stop(b.id()) closes only b's pane");
+        assertEquals(0, paneCloseCount(herdr, "w9:pRoot_1"), "a's pane is untouched");
     }
 
     // --- CB-306 spawn-readiness gate -----------------------------------------------------------
@@ -485,7 +485,7 @@ class ClaudeCodeLauncherTest {
         PeerHandle handle = svc.spawn(new SpawnRequest(null, null, null));
 
         assertNotNull(handle, "spawn still succeeds with zero timeout");
-        assertEquals(0, paneCloseCount(herdr, "w9:pW_1"),
+        assertEquals(0, paneCloseCount(herdr, "w9:pRoot_1"),
                 "no orphan pane close from the gate path");
         assertDoesNotThrow(() -> UUID.fromString(handle.id()));
     }

bridged/src/test/java/dev/ltms/bridged/worker/CompositePeerLauncherTest.java

@@ -223,12 +223,12 @@ class CompositePeerLauncherTest {
         FakeHerdr herdr = new FakeHerdr();
         PeerLauncher composite = composite(herdr);
         PeerHandle handle = composite.spawn(new SpawnRequest("gemini", null, null));
-        assertNotEquals("w9:pW_1", handle.id(), "the id is decoupled from the pane coordinate");
+        assertNotEquals("w9:pRoot_1", handle.id(), "the id is decoupled from the pane coordinate");
 
         composite.stop(handle.id());
         assertTrue(herdr.calls.stream()
                         .anyMatch(c -> c.method().equals("pane.close")
-                                && "w9:pW_1".equals(((Map<?, ?>) c.params()).get("pane_id"))),
+                                && "w9:pRoot_1".equals(((Map<?, ?>) c.params()).get("pane_id"))),
                 "stop routes to the spawning adapter and closes exactly that worker's pane");
     }