feat(session-export): add command and Header action

packages/session-query/session-export/src/index.ts

@@ -0,0 +1,26 @@
+/** Web Session-log download command over the host endpoint owned by ApiProxy. */
+
+import type { Context } from '@deepseek-ai/cordis'
+import type { CommandResult } from '@deepseek-ai/dsh-commands'
+
+export const name = 'session-export'
+export const inject = ['commands']
+
+const REQUESTED: CommandResult = {
+  kind: 'success',
+  text: 'Session log download requested.',
+}
+
+/**
+ * Register the Web-only `/export` command that the browser download plugin observes.
+ * @param ctx - Host context carrying the human-command registry.
+ */
+export function apply(ctx: Context): void {
+  ctx.effect(() => ctx.commands.register({
+    name: 'export',
+    description: 'Download this Session log as a ZIP archive',
+    handler: invocation => Promise.resolve(invocation.rawInput.trim() === ''
+      ? REQUESTED
+      : { kind: 'error', text: 'The Web /export command does not accept a path.' }),
+  }), 'session-export: command')
+}