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>

core/kernel/src/main/kotlin/com/correx/core/kernel/orchestration/ContextFeedback.kt

@@ -15,6 +15,7 @@ import com.correx.core.events.events.StoredEvent
 import com.correx.core.events.types.ArtifactId
 import com.correx.core.events.types.ContextEntryId
 import com.correx.core.events.types.StageId
+import com.correx.core.sessions.BoundAgentInstructions
 import com.correx.core.sessions.BoundProjectProfile
 import com.correx.core.transitions.graph.WorkflowGraph
 import java.util.UUID
@@ -153,3 +154,17 @@ fun buildProjectProfileEntry(profile: BoundProjectProfile): ContextEntry {
         role = EntryRole.SYSTEM,
     )
 }
+
+/** Renders bound CLAUDE.md / AGENTS.md instructions as a single L0 system entry. */
+fun buildAgentInstructionsEntry(instructions: BoundAgentInstructions): ContextEntry {
+    val content = instructions.content
+    return ContextEntry(
+        id = ContextEntryId(UUID.randomUUID().toString()),
+        layer = ContextLayer.L0,
+        content = content,
+        sourceType = "agentInstructions",
+        sourceId = "agent-instructions",
+        tokenEstimate = content.length / 4,
+        role = EntryRole.SYSTEM,
+    )
+}

core/kernel/src/main/kotlin/com/correx/core/kernel/orchestration/SessionOrchestrator.kt

@@ -399,6 +399,8 @@ abstract class SessionOrchestrator(
             } ?: emptyList()
         val projectProfileEntries = session.state.boundProjectProfile
             ?.let { listOf(buildProjectProfileEntry(it)) } ?: emptyList()
+        val agentInstructionsEntries = session.state.boundAgentInstructions
+            ?.let { listOf(buildAgentInstructionsEntry(it)) } ?: emptyList()
         val retryFeedbackEntries = buildRetryFeedbackEntry(sessionEvents, stageId)
             ?.let { listOf(it) } ?: emptyList()
         val vocabularyEntries = artifactKindRegistry
@@ -411,7 +413,8 @@ abstract class SessionOrchestrator(
             .mapNotNull { it.payload as? StaticFindingsRecordedEvent }
             .flatMap { it.findings }
         var accumulatedEntries = excludeStaticFindingsFromReview(
-            systemPrompt + profileEntries + projectProfileEntries + journalEntries + repoMapEntries +
+            systemPrompt + profileEntries + projectProfileEntries + agentInstructionsEntries +
+                journalEntries + repoMapEntries +
                 needsEntries + schemaEntries + vocabularyEntries + promptEntries + steeringEntries +
                 clarificationEntries + retryFeedbackEntries,
             recordedStaticFindings,