Bug: `config.toml` 里 `[experimental] tower = true` 无法启用 tower 模式，只能用环境变量

What version of Kimi Code is running?

Kimi Code CLI 0.39.1（native binary，Linux x64）

Which open platform/subscription were you using?

kimi auth

Which model were you using?

k3

What platform is your computer?

native binary，Linux x64

What issue are you seeing?

在 ~/.kimi-code/config.toml 中写：

[experimental]
tower = true

后启动 kimi，/experiments 面板会显示 Tower mode · enabled · config，但执行 /tower on 或 /tower <目标> 时报错：

Error: Failed to enable tower mode: tower mode could not be enabled — the tower feature is unavailable in this process, or another live session owns the workspace tower

这里「another live session owns the workspace tower」是误导信息：当前目录没有 .tower/，没有 state.json，也没有其他正在运行的 kimi 进程。

What steps can reproduce the bug?

复现步骤

1. 确保 ~/.kimi-code/config.toml 中有 [experimental] tower = true，且环境变量 未设置 KIMI_CODE_EXPERIMENTAL_TOWER。
2. 进入任意有 ≥1 次 commit 的 git 仓库，运行 kimi。
3. /experiments → Tower mode 显示 enabled · config ✅
4. /tower on → 报上面的错误 ❌
5. 退出，用 KIMI_CODE_EXPERIMENTAL_TOWER=1 kimi 重新启动，/tower on → 成功 ✅

同一目录、同一二进制、同一 config，唯一变量是启动方式。

What is the expected behavior?

No response

Additional information

疑似根因

tower 功能服务似乎只在进程启动时组装一次，并且只读取环境变量（isTowerFeatureAssembled(flags) / assembledFlagServices）；而 config.toml 里的 [experimental] 标志是在之后合并进 flag 服务的。/experiments 面板读的是合并后的状态，所以显示「enabled · config」，但 feature 组装快照已经完成，当时 tower flag 仍是关闭状态。

总开关 KIMI_CODE_EXPERIMENTAL_FLAG=1 同样有这个问题，也只认环境变量。

其他 [experimental] 标志（如 tool-select、subagent_fork）从 config 启用是正常的——tower 特殊之处在于它需要启动期服务组装。

建议

• 把 [experimental] 标志也纳入启动期组装路径；或者
• 报错信息区分「启动时 flag 未开」和「工作区被其他会话占用」；或者
• 在 /experiments 面板提示 tower 需要环境变量才能生效。

临时 workaround

export KIMI_CODE_EXPERIMENTAL_TOWER=1
# 建议写进 ~/.bashrc

Contribution

• I am willing to submit a PR for this bug fix myself (please wait for maintainer approval in this issue first)

Start by tracing the startup paths named in the report: isTowerFeatureAssembled(flags) and assembledFlagServices, then compare them with the later config.toml flag merge. Reproduce with [experimental] tower = true and without KIMI_CODE_EXPERIMENTAL_TOWER; done means /tower on works without the environment variable and the misleading ownership error is avoided.