style(copy): fix remaining punctuation violations and make check:copy strict

Auto-fix of 602 string literals across 74 files (half-width punctuation next to
Chinese, parenthesised Chinese, quotes); biome reflow; e2/e6 assertions follow
the new full-width summaries. check:copy now runs with --strict in ci.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/contracts/src/agent.ts

@@ -330,7 +330,7 @@ export const AgentRunStartInput = z.object({
    */
   proposeFirst: z.boolean().default(false),
   /** @deprecated 已取消运行模式;plan_only 按 proposeFirst=true 处理,execute 忽略 */
-  mode: AgentRunMode.optional().describe("已弃用:plan_only 等同 proposeFirst=true"),
+  mode: AgentRunMode.optional().describe("已弃用：plan_only 等同 proposeFirst=true"),
   /** 能力白名单(缺省全部可用能力) */
   capabilityAllowlist: z.array(KnownCapabilityId).min(1).max(50).optional(),
 });