feat(context): role means message type, layer means pinning (#312/#313)

The system block is now for content that does not change during a run.
Anything the run mutates renders as a user message — both because a
mutating system prefix defeats prompt caching and because models
under-weight system-folded content against the trailing user turn.

PromptRenderer: role alone decides the message type; the old
`layer == L0 ||` clause is gone. That clause was silently overriding
role on four packs (InferenceSummarizer, SemanticReviewerImpl,
CapabilityGapReflectorImpl, Talkie session-naming) which are L0+USER
prompts — they were rendering as a system-only request with no user
turn at all.

Re-roled SYSTEM -> USER, all mutable within a run:
  recoveryTicket, remainingDelta, groundingFeedback, rejectionFeedback
  (trailing slot), plus verifiedBaseline, promotedConcept, claimedTask,
  clarificationAnswer, locked steeringNote, factSheet (inline, still
  L0-pinned).
Left SYSTEM (immutable): systemPrompt, operatingGuidance,
schemaInstruction, projectProfile, operatorProfile, agentInstructions,
successfulPlanShape.

Trailing-slot scarcity guard: repairMandateSourceTypes joined ALL
matches, so a recovery stage on a retry with an unmet delta would stack
three competing mandates. Now a precedence list emits exactly one
(recoveryTicket > retryFeedback > groundingFeedback > rejectionFeedback)
with remainingDelta appended as the completion signal.

ContextClassifier keys STATIC on layer alone — L0 means pinned/never
pruned regardless of role, so the re-roled L0 entries don't fall through
to FREEFORM and get token-pruned.

Also fixes a stale ContextFeedbackTest assertion (expected a CAS hash
the producer deliberately stopped emitting) and a stale initialIntent
doc comment claiming L0/SYSTEM where the code says L1/USER.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

core/context/src/main/kotlin/com/correx/core/context/builder/DefaultContextPackBuilder.kt

@@ -364,7 +364,10 @@ class DefaultContextPackBuilder(
         sourceType = "factSheet",
         sourceId = "factSheet",
         tokenEstimate = estimateTokens(content),
-        role = EntryRole.SYSTEM,
+        // #312: re-extracted from the live entry set on EVERY build — the most mutable entry in the
+        // pack, so it must not sit in the cached system prefix. USER, pinned at L0 with the lowest
+        // ordinal so it still renders ahead of the transcript.
+        role = EntryRole.USER,
         ordinal = FACT_SHEET_ORDINAL,
     )
 

core/context/src/main/kotlin/com/correx/core/context/compression/ContextClassifier.kt

@@ -17,9 +17,13 @@ class ContextClassifier {
     fun classify(entry: ContextEntry): ContextClass = when {
         entry.sourceType in STATIC_SOURCES -> ContextClass.STATIC
         entry.sourceType in STRUCTURED_SOURCES -> ContextClass.STRUCTURED
-        // A pinned system directive that isn't one of the known static prompts is still
-        // exact-value content — treat as structured (format-compress ok, never prune).
-        entry.layer == ContextLayer.L0 && entry.role == EntryRole.SYSTEM -> ContextClass.STATIC
+        // A pinned L0 directive that isn't one of the known static prompts is still exact-value
+        // content — never prune it. Keyed on LAYER alone since #312: L0 means "pinned standing
+        // context" (a budget/pinning property), while role now means "which chat message type"
+        // (a rendering property). Several L0 entries are deliberately USER-role now — a mutating
+        // verified baseline, claimed task, clarification answer — and token-pruning those as
+        // freeform prose would shred exactly the directives they exist to carry.
+        entry.layer == ContextLayer.L0 -> ContextClass.STATIC
         entry.role == EntryRole.TOOL -> ContextClass.STRUCTURED
         else -> ContextClass.FREEFORM
     }

core/inference/src/main/kotlin/com/correx/core/inference/PromptRenderer.kt

@@ -26,7 +26,23 @@ object PromptRenderer {
     // than the original stage task. Instead they render as the FINAL user message, right after the
     // tool evidence, where a weak local model attends strongest and reads it as the next action.
     // Add a sourceType here (and set the entry's role to USER) to route it to that trailing slot.
-    private val repairMandateSourceTypes = setOf("retryFeedback")
+    //
+    // #312: highest precedence FIRST — at most ONE mandate renders per turn. The trailing slot works
+    // because it is scarce and authoritative; a recovery stage on a retry with an unmet delta would
+    // otherwise stack three competing "do this next" blocks and the channel becomes noise again.
+    private val repairMandatePrecedence = listOf(
+        "recoveryTicket",
+        "retryFeedback",
+        "groundingFeedback",
+        "rejectionFeedback",
+    )
+
+    // The remaining-delta checklist is not a competing mandate — it is the stage's completion
+    // signal ("what is left to make true") — so it appends after whichever mandate won rather
+    // than displacing it.
+    private const val COMPLETION_SIGNAL = "remainingDelta"
+
+    private val trailingSourceTypes = repairMandatePrecedence.toSet() + COMPLETION_SIGNAL
 
     // Tiebreak only: when entries carry no chronological ordinal (all 0 — e.g. router
     // chat, which assembles its pack directly), fall back to the old layer priority that
@@ -38,33 +54,48 @@ object PromptRenderer {
     }
 
     fun render(contextPack: ContextPack): List<ChatMessage> {
-        // Every SYSTEM-role entry folds into the single leading system message, whatever its
-        // layer (L0 additionally folds regardless of role). Strict chat templates (e.g. Qwen)
-        // reject any system message that is not the first message, so recalled memory, stage
-        // summaries, and retrieval entries must never render as standalone system turns.
+        // Every SYSTEM-role entry folds into the single leading system message, whatever its layer.
+        // Strict chat templates (e.g. Qwen) reject any system message that is not the first message,
+        // so recalled memory, stage summaries, and retrieval entries must never render as standalone
+        // system turns.
+        //
+        // #312: ROLE alone decides the message type — the old `layer == L0 ||` clause is gone. The
+        // system block is for content that does not change during a run (prompts, guidance, profiles);
+        // anything the run mutates (steering, gate verdicts, tickets, baselines, claimed task) is a
+        // user message, both because a mutating system prefix defeats prompt caching and because
+        // models under-weight system-folded content relative to the trailing user turn. Layer keeps
+        // its own job — budget tier and pin/prune eligibility (see ContextClassifier).
         val (systemEntries, conversationEntries) = contextPack.layers.entries
             .flatMap { (layer, entries) -> entries.map { layer to it } }
-            .partition { (layer, entry) -> layer == ContextLayer.L0 || entry.role == EntryRole.SYSTEM }
+            .partition { (_, entry) -> entry.role == EntryRole.SYSTEM }
         val systemContent = systemEntries
             .sortedWith(compareBy({ it.first.ordinal }, { it.second.ordinal }))
             .joinToString("\n\n") { it.second.content }
             .takeIf { it.isNotBlank() }
         // #293: pull repair mandates out of the inline flow — they render once, as the last turn.
         val (repairPairs, inlinePairs) = conversationEntries
-            .partition { it.second.sourceType in repairMandateSourceTypes }
+            .partition { it.second.sourceType in trailingSourceTypes }
         val conversationMessages = inlinePairs
             .sortedWith(compareBy({ it.second.ordinal }, { layerPriority(it.first) }))
             .map { (_, entry) -> entry.toChatMessage() }
-        val repairMandate = repairPairs
-            .sortedBy { it.second.ordinal }
-            .joinToString("\n\n") { it.second.content }
+        // Only the highest-precedence mandate present survives; the rest stay out of the prompt
+        // entirely (their content is still in the transcript/event log — this slot is not their
+        // only carrier). The completion signal appends after it.
+        val mandate = repairMandatePrecedence.firstNotNullOfOrNull { sourceType ->
+            repairPairs.contentOf(sourceType)
+        }
+        val repairMandate = listOfNotNull(mandate, repairPairs.contentOf(COMPLETION_SIGNAL))
+            .joinToString("\n\n")
             .takeIf { it.isNotBlank() }
-        // Repetition anchoring: steering directives fold into the leading system message, far
-        // from the final query — weak local models forget them (lost-in-the-middle). Restate
+        // Repetition anchoring: steering directives render early (they are pinned standing context),
+        // far from the final query — weak local models forget them (lost-in-the-middle). Restate
         // them once as a trailing user turn, where models attend strongest. Template-safe: a
-        // user message at the end never trips strict system-must-be-first templates.
-        val anchor = systemEntries
+        // user message at the end never trips strict system-must-be-first templates. Scans every
+        // entry, not just the system fold: since #312 a locked steering note is USER-role too, and
+        // both the locked and unlocked paths deserve the same anchor.
+        val anchor = (systemEntries + conversationEntries)
             .filter { it.second.sourceType == "steeringNote" }
+            .sortedBy { it.second.ordinal }
             .joinToString("\n") { it.second.content }
             .takeIf { it.isNotBlank() }
         val messages = buildList {
@@ -77,6 +108,12 @@ object PromptRenderer {
         return messages.ifEmpty { listOf(ChatMessage("user", "")) }
     }
 
+    private fun List<Pair<ContextLayer, ContextEntry>>.contentOf(sourceType: String): String? =
+        filter { it.second.sourceType == sourceType }
+            .sortedBy { it.second.ordinal }
+            .joinToString("\n\n") { it.second.content }
+            .takeIf { it.isNotBlank() }
+
     private fun ContextEntry.toChatMessage(): ChatMessage = ChatMessage(
         role = when (role) {
             EntryRole.SYSTEM -> "system"

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

@@ -104,7 +104,8 @@ fun buildGroundingFeedbackEntry(events: List<StoredEvent>, stageId: StageId): Co
         sourceType = "groundingFeedback",
         sourceId = stageId.value,
         tokenEstimate = content.length / 4,
-        role = EntryRole.SYSTEM,
+        // #312: a gate verdict is run-state, not standing instruction — USER, trailing slot.
+        role = EntryRole.USER,
     )
 }
 
@@ -165,7 +166,10 @@ fun buildRecoveryTicketEntry(events: List<StoredEvent>, stageId: StageId): Conte
         sourceType = "recoveryTicket",
         sourceId = stageId.value,
         tokenEstimate = content.length / 4,
-        role = EntryRole.SYSTEM,
+        // #312: the recovery stage exists ONLY because of this ticket, yet as SYSTEM it folded in
+        // above the whole transcript. It is the same shape as retryFeedback — USER, trailing slot,
+        // and highest precedence there.
+        role = EntryRole.USER,
     )
 }
 
@@ -206,7 +210,11 @@ fun buildRemainingDeltaEntry(items: List<Triple<String, String, String>>): Conte
         sourceType = "remainingDelta",
         sourceId = "remaining-delta",
         tokenEstimate = content.length / 4,
-        role = EntryRole.SYSTEM,
+        // #312: recomputed every turn a write lands — the single most mutable entry in the pack.
+        // As SYSTEM it both sat in the weakest slot and invalidated the cached system prefix each
+        // turn. USER, and appended after whichever repair mandate won (it is the completion signal,
+        // not a competing instruction).
+        role = EntryRole.USER,
     )
 }
 

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

@@ -65,7 +65,9 @@ internal suspend fun SessionOrchestrator.promotedConceptEntries(stageConfig: Sta
             sourceType = "promotedConcept",
             sourceId = concept.classKey.ifBlank { concept.fingerprint },
             tokenEstimate = estimateTokens(content),
-            role = EntryRole.SYSTEM,
+            // #312: folded from the whole log including THIS run, so a concept promoted or
+            // contradicted mid-run changes the set between stages. Mutable ⇒ USER.
+            role = EntryRole.USER,
         )
     }
 }

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

@@ -85,7 +85,10 @@ internal suspend fun SessionOrchestrator.buildSteeringNoteEntries(sessionId: Ses
                 sourceType = "steeringNote",
                 sourceId = p.stageId?.value ?: sessionId.value,
                 tokenEstimate = estimateTokens(p.content),
-                role = EntryRole.SYSTEM,
+                // #312: an operator steering note arrives mid-run by definition — mutable ⇒ USER,
+                // same as the unlocked path below. Locked notes keep L0 so they stay pinned against
+                // the budget; PromptRenderer still restates every note as a trailing anchor.
+                role = EntryRole.USER,
             )
             // An operator steering note attached to a decision is a real instruction; keep it.
             // Bare rejections are consolidated separately (buildRejectionFeedbackEntry) so they
@@ -140,18 +143,20 @@ fun buildRejectionFeedbackEntry(events: List<StoredEvent>, stageId: StageId): Co
         sourceType = "rejectionFeedback",
         sourceId = stageId.value,
         tokenEstimate = content.length / 4,
-        role = EntryRole.SYSTEM,
+        // #312: literally operator voice ("the operator declined"), and it grows mid-stage as more
+        // calls are rejected — USER, trailing slot.
+        role = EntryRole.USER,
     )
 }
 
 /**
- * Injects the initial user intent (the freeform request that started the run) as a pinned L0
- * SYSTEM entry present in EVERY stage's context (architecture-conformance, 2026-07-14). The intent
+ * Injects the initial user intent (the freeform request that started the run) as an L1 USER entry
+ * present in EVERY stage's context (architecture-conformance, 2026-07-14). The intent
  * is the single most load-bearing constraint of a run, yet it previously reached normal stages only
  * as a repo-map retrieval seed (repoKnowledgeQuery) or, on the rare Tier-2 recovery path, the
  * arbiter ticket — so an implementer could drift from the goal with the goal itself absent from its
- * authoritative context. Standing at L0/SYSTEM it is weighted as an instruction and never dropped
- * under budget. Absent for fixed-task workflows (no InitialIntentEvent) → empty.
+ * authoritative context. It is REQUIRED-bucket, so it is never dropped under budget. Absent for
+ * fixed-task workflows (no InitialIntentEvent) → empty.
  */
 
 internal suspend fun SessionOrchestrator.buildIntentEntry(sessionId: SessionId): List<ContextEntry> {
@@ -183,8 +188,9 @@ internal fun SessionOrchestrator.initialIntent(sessionId: SessionId): String? =
 /**
  * Injects the operator's answers to a stage's open questions as a pinned L0 SYSTEM entry, so the
  * stage sees its own questions resolved on the clarification re-run. The prompt calls these answers
- * "authoritative", so they are placed as authoritative standing instructions (L0/SYSTEM), not a
- * droppable L2 USER turn — matching the mechanics to the stated authority. Correlates each answer's
+ * "authoritative", so they are pinned as standing context (L0) rather than a droppable L2 turn —
+ * matching the mechanics to the stated authority. They render as USER (#312): these are the
+ * operator's own words, and the set grows with each clarification round. Correlates each answer's
  * questionId back to the prompt recorded on the [ClarificationRequestedEvent].
  */
 
@@ -209,7 +215,8 @@ internal suspend fun SessionOrchestrator.buildClarificationAnswerEntries(session
             sourceType = "clarificationAnswer",
             sourceId = sessionId.value,
             tokenEstimate = estimateTokens(content),
-            role = EntryRole.SYSTEM,
+            // #312: operator's own words, and the set grows per clarification round — USER.
+            role = EntryRole.USER,
         ),
     )
 }

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

@@ -264,7 +264,8 @@ internal suspend fun SessionOrchestrator.executeStage(
                     sourceType = "claimedTask",
                     sourceId = stageId.value,
                     tokenEstimate = estimateTokens(bundle),
-                    role = EntryRole.SYSTEM,
+                    // #312: the claim advances as the run progresses — mutable ⇒ USER (stays L0).
+                    role = EntryRole.USER,
                 ),
             )
         } ?: emptyList()

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

@@ -86,7 +86,9 @@ internal suspend fun SessionOrchestrator.verifiedBaselineEntries(sessionId: Sess
             sourceType = "verifiedBaseline",
             sourceId = lastPass.stateKey,
             tokenEstimate = estimateTokens(content),
-            role = EntryRole.SYSTEM,
+            // #312: flips known-good → STALE the moment a write lands, i.e. it changes within a
+            // single stage. Mutable ⇒ USER (stays L0, so it is still pinned and never pruned).
+            role = EntryRole.USER,
         ),
     )
 }

core/kernel/src/test/kotlin/com/correx/core/kernel/orchestration/RemainingDeltaEntryTest.kt

@@ -22,7 +22,9 @@ class RemainingDeltaEntryTest {
             ),
         )!!
         assertEquals("remainingDelta", entry.sourceType)
-        assertEquals(EntryRole.SYSTEM, entry.role)
+        // #312: USER, not SYSTEM — it is recomputed every turn a write lands, so it must stay out
+        // of the cached system prefix, and PromptRenderer routes it to the trailing slot.
+        assertEquals(EntryRole.USER, entry.role)
         // Forward-looking framing, not a history of what was done.
         assertTrue(entry.content.contains("Remaining to finish this stage"))
         assertTrue(entry.content.contains("- [ ] frontend/src/views/TaskView.tsx — exports_default_component"))