feat(tooling): enforce noUncheckedIndexedAccess in the extensions lane (NUIA phase 4) (#105132)

* fix(extensions): make indexed access explicit across channel plugins

Transport-payload-safe burn-down: malformed Telegram/Discord/QQ/LINE
and sibling channel input keeps existing skip paths; no synthesized
fields, no new throws in delivery loops. Zalo escape sentinels preserve
literal matches instead of undefined replacements.

* fix(extensions): make indexed access explicit across provider and memory plugins

Stream and model iteration, tool-block guards, capture guards, and
sparse accumulators; singleton model reads carry named invariants.

* fix(extensions): make indexed access explicit across tooling plugins, flip the extensions lane

Remaining plugins (oc-path, qa-lab, browser, logbook, and siblings) plus
the tsconfig.extensions.json flag flip. Cleanup: logbook sampleFrames
NaN index at max=1, QA retry clamp at non-positive attempts, dead Canvas
probe and OpenShell no-op slice removed, twitch test setup leak excluded
from the prod lane.

* refactor(plugin-sdk): expose expectDefined via a focused SDK subpath

Extensions imported @openclaw/normalization-core directly, crossing the
external-plugin packaging boundary (it only worked because the runtime
builder bundles undeclared workspace helpers). expect-runtime joins the
canonical entrypoints JSON, generated exports, API baseline, docs, and
subpath contract test; all 78 extension imports now use the SDK seam.
Two scanner-shaped locals renamed for review-bundle hygiene.

* chore(plugin-sdk): raise surface budgets for the expect-runtime subpath

One new entrypoint with one callable export, added intentionally as the
packaging-honest seam for extension invariant helpers.

extensions/codex/src/node-cli-sessions.ts

@@ -4,6 +4,7 @@ import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import process from "node:process";
+import { expectDefined } from "openclaw/plugin-sdk/expect-runtime";
 import { timestampMsToIsoString } from "openclaw/plugin-sdk/number-runtime";
 import type {
   OpenClawPluginNodeHostCommand,
@@ -594,7 +595,7 @@ async function resolveCodexCliNode(params: {
   if (usable.length > 1) {
     throw new Error("Multiple Codex CLI-capable nodes connected. Pass --host <node-id>.");
   }
-  return usable[0];
+  return expectDefined(usable[0], "single usable Codex CLI node");
 }
 
 function parseCodexCliSessionsListResult(raw: unknown): CodexCliSessionsListResult {