chore(showcase/langgraph-python): Phase 0 cleanup of orphans and dead probes

- delete orphan e2e specs (hitl, interrupt-headless,
  tool-rendering-reasoning-chain)
- rename reasoning-default-render → reasoning-default (route + describe)
- delete dead D5 probes (hitl-steps, interrupt-headless,
  tool-rendering-reasoning-chain)
- update d5-feature-mapping: rename agentic-chat-reasoning →
  reasoning-custom and reasoning-default-render → reasoning-default;
  repoint hitl + hitl-in-chat-booking to hitl-text-input (still used by
  ag2/agno/built-in-agent)
- update d5-registry: drop hitl-steps, interrupt-headless,
  tool-rendering-reasoning-chain feature types
- update d5-reasoning-display preNavigateRoute branch logic and tests
- update probes.test.ts and e2e-deep.test.ts to use surviving feature
  types

Author: AlemTuzlak

showcase/harness/src/http/probes.test.ts

@@ -956,13 +956,13 @@ describe("POST /api/probes/:id/trigger — B2 featureTypes validation", () => {
         "Content-Type": "application/json",
       },
       body: JSON.stringify({
-        filter: { featureTypes: ["hitl-steps"] },
+        filter: { featureTypes: ["hitl-text-input"] },
       }),
     });
     expect(res.status).toBe(200);
     // Verify featureTypes is threaded through to scheduler.trigger opts
     expect(sched.lastTriggerOpts).toEqual({
-      filter: { featureTypes: ["hitl-steps"] },
+      filter: { featureTypes: ["hitl-text-input"] },
     });
   });
 

showcase/harness/src/probes/drivers/e2e-deep.test.ts

@@ -995,7 +995,7 @@ describe("e2e-deep feature-type filtering (driver level)", () => {
     const { writer, writes } = mkWriter();
 
     const ctx = mkCtx(writer);
-    ctx.featureTypes = ["hitl-steps"]; // not registered
+    ctx.featureTypes = ["hitl-text-input"]; // scriptLoader no-op so no probe loaded
 
     const result = await driver.run(ctx, {
       key: "e2e-deep:showcase-test",

showcase/harness/src/probes/helpers/d5-feature-mapping.ts

@@ -90,7 +90,10 @@ const REGISTRY_TO_D5: Readonly<Record<string, readonly D5FeatureType[]>> = {
   // skipped by `demosToFeatureTypes`).
   "hitl-in-chat": ["hitl-text-input"],
   "hitl-in-chat-booking": ["hitl-text-input"],
-  hitl: ["hitl-steps"],
+  // `hitl` is used by ag2 / agno / built-in-agent / others as an alias of
+  // hitl-in-chat. Repointed to `hitl-text-input` after `d5-hitl-steps.ts`
+  // was removed in the genuine-pass Phase 0 cleanup.
+  hitl: ["hitl-text-input"],
 
   // hitl (approve/deny tier) — out-of-chat modal approval flow.
   "hitl-in-app": ["hitl-approve-deny"],
@@ -143,12 +146,11 @@ const REGISTRY_TO_D5: Readonly<Record<string, readonly D5FeatureType[]>> = {
   "frontend-tools-async": ["frontend-tools-async"],
 
   // Reasoning family — single `reasoning-display` literal covers both
-  // demo routes via preNavigateRoute. tool-rendering-reasoning-chain is
-  // split because its assertion shape interleaves tool render with
-  // reasoning block.
-  "agentic-chat-reasoning": ["reasoning-display"],
-  "reasoning-default-render": ["reasoning-display"],
-  "tool-rendering-reasoning-chain": ["tool-rendering-reasoning-chain"],
+  // demo routes via preNavigateRoute. The `tool-rendering-reasoning-chain`
+  // demo was removed in the LGP demo-pass; its mapping entry and probe
+  // script were deleted in the genuine-pass Phase 0 cleanup.
+  "reasoning-custom": ["reasoning-display"],
+  "reasoning-default": ["reasoning-display"],
 
   // State family — `shared-state-read` registry feature reuses the
   // existing `shared-state-read` D5 literal (already paired with
@@ -168,9 +170,9 @@ const REGISTRY_TO_D5: Readonly<Record<string, readonly D5FeatureType[]>> = {
   "gen-ui-agent": ["gen-ui-agent"],
 
   // Interrupt family — LangGraph interrupt-driven HITL, distinct from
-  // useHumanInTheLoop hook patterns. Two demos = two literals (one
-  // headless, one gen-UI yielding interrupt).
-  "interrupt-headless": ["interrupt-headless"],
+  // useHumanInTheLoop hook patterns. The `interrupt-headless` demo was
+  // removed in the LGP demo-pass; its mapping entry and probe script
+  // were deleted in the genuine-pass Phase 0 cleanup.
   "gen-ui-interrupt": ["gen-ui-interrupt"],
 
   // BYOC family — single literal covers hashbrown + json-render via

showcase/harness/src/probes/helpers/d5-registry.ts

@@ -37,7 +37,6 @@ export type D5FeatureType =
   | "shared-state-read"
   | "shared-state-write"
   | "hitl-approve-deny"
-  | "hitl-steps"
   | "hitl-text-input"
   | "gen-ui-headless"
   | "gen-ui-headless-complete"
@@ -59,7 +58,6 @@ export type D5FeatureType =
   | "frontend-tools-async"
   // Reasoning family — reasoning/thinking block + final answer.
   | "reasoning-display"
-  | "tool-rendering-reasoning-chain"
   // State family — streaming state updates and read-only agent context.
   | "shared-state-streaming"
   | "readonly-state-context"
@@ -70,7 +68,6 @@ export type D5FeatureType =
   | "gen-ui-agent"
   // Interrupt family — LangGraph-interrupt-driven HITL (distinct from
   // useHumanInTheLoop hook patterns).
-  | "interrupt-headless"
   | "gen-ui-interrupt"
   // BYOC family — bring-your-own-component structured-output rendering
   // (one literal covers hashbrown + json-render via preNavigateRoute).
@@ -103,7 +100,6 @@ const D5_FEATURE_TYPES: readonly D5FeatureType[] = [
   "shared-state-read",
   "shared-state-write",
   "hitl-approve-deny",
-  "hitl-steps",
   "hitl-text-input",
   "gen-ui-headless",
   "gen-ui-headless-complete",
@@ -120,14 +116,12 @@ const D5_FEATURE_TYPES: readonly D5FeatureType[] = [
   "frontend-tools",
   "frontend-tools-async",
   "reasoning-display",
-  "tool-rendering-reasoning-chain",
   "shared-state-streaming",
   "readonly-state-context",
   "gen-ui-declarative",
   "gen-ui-a2ui-fixed",
   "gen-ui-open",
   "gen-ui-agent",
-  "interrupt-headless",
   "gen-ui-interrupt",
   "byoc",
   "voice",