enh(#142): centralize runtime alias canonicalization seam (#143)

* fix(#142): canonicalize runtime aliases across cjs and sdk

* fix(#142): satisfy hand-sync and inventory parity gates

* test(#1974): remove record-session lock contention in context monitor spec

* test(config): retry transient config-ensure-section failures

* docs(context): capture PR #143 CI reliability findings

* fix(#142): bump CLI Modules inventory headline to 76 (runtime-name-policy + runtime-slash)

docs/INVENTORY.md had the two new .cjs rows listed but the headline
count stayed at 75; fs count is 76. inventory-counts.test.cjs caught
the drift.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

sdk/src/runtime-gate.ts

@@ -13,6 +13,7 @@
  * for non-Claude runtimes.
  */
 import { detectRuntime, SUPPORTED_RUNTIMES, type Runtime } from './query/helpers.js';
+import { canonicalizeRuntimeName } from './runtime-name-policy.js';
 
 /**
  * Throw a clear error when the active runtime is not Claude.
@@ -33,8 +34,9 @@ export function assertRuntimeSupportsAutoMode(config?: Record<string, unknown> |
   // a `GSD_RUNTIME` value that isn't in SUPPORTED_RUNTIMES falls through to
   // the config tier, so reporting it as the source would be misleading.
   const env = process.env.GSD_RUNTIME;
+  const envCanonical = canonicalizeRuntimeName(env);
   const envIsSupported =
-    typeof env === 'string' && (SUPPORTED_RUNTIMES as readonly string[]).includes(env);
+    typeof envCanonical === 'string' && (SUPPORTED_RUNTIMES as readonly string[]).includes(envCanonical);
   const source = envIsSupported
     ? `GSD_RUNTIME=${env}`
     : `config.runtime="${String(cfg.runtime ?? '')}"`;