fix: resolve project ID for non-git directories

[MaxPylypko]

Summary

Fixes #902, #354, #2012

When no .git directory is found, fromDirectory() returned ProjectID.global immediately, skipping resolveProjectId() which already handles non-git directories by creating .mimocode-project-id with a unique UUID.

This caused all non-git projects to share the same global project memory, preventing memory isolation between different working directories.

Root Cause

In packages/opencode/src/project/project.ts, the fromDirectory() function:

if (!dotgit) {
  return {
    id: ProjectID.global,  // ← always global
    worktree: "/",
    sandbox: "/",
    vcs: fakeVcs,
  }
}

The resolveProjectId() function in project-id.ts already has logic for non-git directories:

// Non-git path
const localFile = path.join(workingDir, ".mimocode-project-id")
const cached = readFileTrimmedOrNull(localFile)
if (cached) return ProjectID.make(cached)
const newId = crypto.randomUUID()
fs.writeFileSync(localFile, newId)  // ← creates the file
return ProjectID.make(newId)

But this code was dead code — never reached because fromDirectory() returned early with ProjectID.global.

Fix

Call resolveProjectId(directory) for non-git directories:

if (!dotgit) {
  const id = resolveProjectId(directory)
  return {
    id,
    worktree: directory,
    sandbox: directory,
    vcs: fakeVcs,
  }
}

This creates .mimocode-project-id in the working directory with a unique UUID, giving each directory its own project memory at memory/projects/<uuid>/MEMORY.md.

Impact

• Non-git directories now get isolated project memory
• Existing .mimocode-project-id files are preserved (read before write)
• Git repositories are unaffected (existing code path)
• MIMOCODE_DISABLE_GIT flag still returns ProjectID.global as before

Testing

• bun typecheck passes
• Manual verification: non-git directory creates .mimocode-project-id and gets unique project ID
• Tested with Bun 1.3.14 (required version per packageManager in package.json)

Build Notes

• Build command: bun run build:local (from repo root)
• Bun version: 1.3.14 (required, do NOT use 1.4.0 — causes runtime hangs)
• Output: packages/opencode/dist/mimocode-linux-x64/bin/mimo

---

中文摘要

修复 #902、#354、#2012

当工作目录没有 .git 时，fromDirectory() 直接返回 ProjectID.global，跳过了 resolveProjectId() 中已有的为非 git 目录创建 .mimocode-project-id 的逻辑。

这导致所有非 git 项目共享同一个 global 项目记忆，无法实现不同工作目录之间的记忆隔离。

根因

project.ts 中的 fromDirectory() 函数在未找到 .git 时立即返回 ProjectID.global，而 project-id.ts 中的 resolveProjectId() 虽然已有处理非 git 目录的代码（创建 .mimocode-project-id 文件），但该代码从未被执行——属于死代码。

修复

对非 git 目录调用 resolveProjectId(directory)，在工作目录下创建 .mimocode-project-id 文件并生成唯一 UUID，使每个目录拥有独立的项目记忆 memory/projects/<uuid>/MEMORY.md。

影响

• 非 git 目录现在拥有独立的项目记忆
• 已有的 .mimocode-project-id 文件会被保留（先读后写）
• Git 仓库不受影响（走原有代码路径）
• MIMOCODE_DISABLE_GIT 标志仍返回 ProjectID.global

构建说明

• 构建命令：bun run build:local（在仓库根目录执行）
• Bun 版本：1.3.14（必需，不要使用 1.4.0 — 会导致运行时挂起）
• 输出：packages/opencode/dist/mimocode-linux-x64/bin/mimo