CLI: add root --help fast path and lazy channel option resolution (#30975)

* CLI argv: add strict root help invocation guard

* Entry: add root help fast-path bootstrap bypass

* CLI context: lazily resolve channel options

* CLI context tests: cover lazy channel option resolution

* CLI argv tests: cover root help invocation detection

* Changelog: note additional startup path optimizations

* Changelog: split startup follow-up into #30975 entry

* CLI channel options: load precomputed startup metadata

* CLI channel options tests: cover precomputed metadata path

* Build: generate CLI startup metadata during build

* Build script: invoke CLI startup metadata generator

* CLI routes: preload plugins for routed health

* CLI routes tests: assert health plugin preload

* CLI: add experimental bundled entry and snapshot helper

* Tools: compare CLI startup entries in benchmark script

* Docs: add startup tuning notes for Pi and VM hosts

* CLI: drop bundled entry runtime toggle

* Build: remove bundled and snapshot scripts

* Tools: remove bundled-entry benchmark shortcut

* Docs: remove bundled startup bench examples

* Docs: remove Pi bundled entry mention

* Docs: remove VM bundled entry mention

* Changelog: remove bundled startup follow-up claims

* Build: remove snapshot helper script

* Build: remove CLI bundle tsdown config

* Doctor: add low-power startup optimization hints

* Doctor: run startup optimization hint checks

* Doctor tests: cover startup optimization host targeting

* Doctor tests: mock startup optimization note export

* CLI argv: require strict root-only help fast path

* CLI argv tests: cover mixed root-help invocations

* CLI channel options: merge metadata with runtime catalog

* CLI channel options tests: assert dynamic catalog merge

* Changelog: align #30975 startup follow-up scope

* Docs tests: remove secondary-entry startup bench note

* Docs Pi: add systemd recovery reference link

* Docs VPS: add systemd recovery reference link

src/cli/program/context.ts

@@ -9,11 +9,24 @@ export type ProgramContext = {
 };
 
 export function createProgramContext(): ProgramContext {
-  const channelOptions = resolveCliChannelOptions();
+  let cachedChannelOptions: string[] | undefined;
+  const getChannelOptions = (): string[] => {
+    if (cachedChannelOptions === undefined) {
+      cachedChannelOptions = resolveCliChannelOptions();
+    }
+    return cachedChannelOptions;
+  };
+
   return {
     programVersion: VERSION,
-    channelOptions,
-    messageChannelOptions: channelOptions.join("|"),
-    agentChannelOptions: ["last", ...channelOptions].join("|"),
+    get channelOptions() {
+      return getChannelOptions();
+    },
+    get messageChannelOptions() {
+      return getChannelOptions().join("|");
+    },
+    get agentChannelOptions() {
+      return ["last", ...getChannelOptions()].join("|");
+    },
   };
 }