feat(gateway): register fabric.register gateway method for live no-restart registration

Recruitment's register-agent step is a plain shell step (no LLM turn), so it
cannot invoke the `fabric-register` TOOL (tool only fires inside an agent
turn) and there is no `openclaw tools call` CLI. It previously fell back to
the standalone bootstrap binary, which writes fabric-identity.json but cannot
notify the running plugin -> the new agent's inbound socket only came up after
a gateway restart.

This adds an in-process gateway method `fabric.register` (scope:
operator.write) whose handler runs inbound.addAccount: validates the key,
persists identity, and brings the inbound socket up immediately. The script
now calls `openclaw gateway call fabric.register --params ...` and only falls
back to the bootstrap binary if the method is unavailable.

Also resyncs committed dist/ to source (sub-discussion-hook/store + tools/
inbound were source-committed but their dist artifacts were stale).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

dist/fabric/src/channel.js

@@ -128,6 +128,7 @@ export const fabricChannelPlugin = createChatChannelPlugin({
                 // Mirror isConfigured here so the snapshot truthfully reports false for
                 // any account without a fabricApiKey.
                 describeAccount: (account) => ({
+                    accountId: account.accountId,
                     configured: Boolean(account.fabricApiKey),
                 }),
             },