feat(context): inject CLAUDE.md / AGENTS.md as L0 standing context

On session start, discover CLAUDE.md and AGENTS.md at the bound workspace root and inject
their (concatenated, header-labeled) contents as an L0 system context entry for every stage —
mirroring the .correx/project.toml ProjectProfile path end to end. Recorded as
AgentInstructionsBoundEvent (invariant #9) so replay reads the recorded fact, not the live
file; folded into SessionState.boundAgentInstructions and rendered by buildAgentInstructionsEntry
right after the project profile. AgentInstructionsLoader reads root-only, both files if present.
Bound via ServerModule.bindAgentInstructions alongside bindProjectProfile.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

testing/kernel/src/test/kotlin/ContextFeedbackTest.kt

@@ -11,11 +11,13 @@ import com.correx.core.events.types.SessionId
 import com.correx.core.events.types.StageId
 import com.correx.core.events.types.TransitionId
 import com.correx.core.events.events.RepoKnowledgeHit
+import com.correx.core.kernel.orchestration.buildAgentInstructionsEntry
 import com.correx.core.kernel.orchestration.buildArtifactKindVocabularyEntry
 import com.correx.core.kernel.orchestration.buildProjectProfileEntry
 import com.correx.core.kernel.orchestration.buildRelevantFilesEntry
 import com.correx.core.kernel.orchestration.buildRetryFeedbackEntry
 import com.correx.core.kernel.orchestration.criticArtifactIds
+import com.correx.core.sessions.BoundAgentInstructions
 import com.correx.core.sessions.BoundProjectProfile
 import com.correx.core.transitions.graph.StageConfig
 import com.correx.core.transitions.graph.TransitionEdge
@@ -87,6 +89,21 @@ class ContextFeedbackTest {
         assertEquals("projectProfile", entry.sourceType)
     }
 
+    @Test
+    fun `agent instructions render as single L0 entry`() {
+        val entry = buildAgentInstructionsEntry(
+            BoundAgentInstructions(
+                sources = listOf("CLAUDE.md", "AGENTS.md"),
+                content = "# CLAUDE.md\n\nbe careful\n\n# AGENTS.md\n\nuse tools",
+            ),
+        )
+        assertEquals(ContextLayer.L0, entry.layer)
+        assertEquals(EntryRole.SYSTEM, entry.role)
+        assertEquals("agentInstructions", entry.sourceType)
+        assertTrue(entry.content.contains("# CLAUDE.md"), "content: ${entry.content}")
+        assertTrue(entry.content.contains("# AGENTS.md"), "content: ${entry.content}")
+    }
+
     @Test
     fun `criticArtifactIds resolves the from-stage produces on a back-edge`() {
         val graph = graphWith(

testing/projections/src/test/kotlin/DefaultSessionReducerTest.kt

@@ -10,7 +10,9 @@ import com.correx.core.events.events.WorkflowStartedEvent
 import com.correx.core.events.types.SessionId
 import com.correx.core.events.types.StageId
 import com.correx.core.events.types.TransitionId
+import com.correx.core.events.events.AgentInstructionsBoundEvent
 import com.correx.core.events.events.ProjectProfileBoundEvent
+import com.correx.core.sessions.BoundAgentInstructions
 import com.correx.core.sessions.BoundProjectProfile
 import com.correx.core.sessions.BoundWorkspace
 import com.correx.core.sessions.DefaultSessionReducer
@@ -327,6 +329,50 @@ class DefaultSessionReducerTest {
         assertEquals("kernel project", result.boundProjectProfile?.about)
     }
 
+    @Test
+    fun `AgentInstructionsBoundEvent reduces into boundAgentInstructions`() {
+        val result = reducer.reduce(
+            state = initialState(),
+            event = stored(
+                sessionId = sessionId,
+                payload = AgentInstructionsBoundEvent(
+                    sessionId = sessionId,
+                    workspaceRoot = "/repo",
+                    sources = listOf("CLAUDE.md", "AGENTS.md"),
+                    content = "# CLAUDE.md\n\nbe careful",
+                ),
+            ),
+        )
+
+        assertEquals(
+            BoundAgentInstructions(
+                sources = listOf("CLAUDE.md", "AGENTS.md"),
+                content = "# CLAUDE.md\n\nbe careful",
+            ),
+            result.boundAgentInstructions,
+        )
+    }
+
+    @Test
+    fun `boundAgentInstructions is preserved by subsequent unrelated events`() {
+        val withInstructions = initialState().copy(
+            boundAgentInstructions = BoundAgentInstructions(
+                sources = listOf("CLAUDE.md"),
+                content = "# CLAUDE.md\n\nrules",
+            ),
+        )
+
+        val result = reducer.reduce(
+            state = withInstructions,
+            event = stored(
+                sessionId = sessionId,
+                payload = WorkflowStartedEvent(sessionId, workflowId = "wf", startStageId = StageId("s1")),
+            ),
+        )
+
+        assertEquals(listOf("CLAUDE.md"), result.boundAgentInstructions?.sources)
+    }
+
     private fun initialState() =
         SessionState(
             status = SessionStatus.CREATED