Add v0.1.0-rc.11 and v0.1.0-rc.12 release notes

Author: YuLaiZ

.github/release-notes/v0.1.0-rc.11.md

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+### Fixed
+- The updater now writes a per-run upgrade log at `~/.token-usage/logs/update-YYYY-MM-DD.log` (mode 0600, 7-day retention), covering every step on both platforms with `[update]`, `[install]`, and `[helper]` prefixes, including all failure paths and the three-state helper result (ok / failure recorded / write failed)
+- Stale files are now cleaned up: the result dead-letter file is consumed (read, logged, deleted) on the next update once provenance is trusted — including the no-update path; POSIX nonce remnants are swept; the external stage file is removed after install succeeds or fails
+
+<!-- zh -->
+### 修复
+- 更新器现会写入本次运行的升级日志 `~/.token-usage/logs/update-YYYY-MM-DD.log`（0600，7 天保留），覆盖双平台每一步（`[update]`、`[install]`、`[helper]` 前缀），含全部失败路径与 helper 三态终态结果（ok / failure recorded / write failed）
+- 残留文件现会清理：result 死信文件在下次更新 provenance 可信后被消费（读取、记录、删除），包含无更新路径；POSIX nonce 残留由 sweep 兜底；外部 stage 文件在安装成功或失败后删除

.github/release-notes/v0.1.0-rc.12.md

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+### Changed
+- macOS and Windows upgrade verification target (same codebase as rc.11)
+
+<!-- zh -->
+### 变更
+- macOS 与 Windows 升级验证目标（与 rc.11 同代码基线）