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-events.ts

@@ -371,7 +371,7 @@ function interactionHint(
         summary: e.outcome === "chosen" ? `已选 ${e.choice}` : e.outcome === "rejected" ? "都不要" : "超时未选",
       };
     case "approval_requested":
-      return { capabilityId: e.capabilityId, phase: "started", summary: `等待审批:${e.summary}`.slice(0, 600) };
+      return { capabilityId: e.capabilityId, phase: "started", summary: `等待审批：${e.summary}`.slice(0, 600) };
     case "approval_resolved":
       return {
         capabilityId: "approval",