feat: OpenMesh 基础平台与 MD/PDF 转换技能

- 后端: coworker 智能体框架, WS API, 文件上传, 附件处理
- 前端: Open WebUI, 文件全量走 upload API (含 MD/TXT/JSON 等文本类)
- 技能: md-to-office (pandoc + wkhtmltopdf)
- 修复: 上传文件路径丢失, Agent 搜索浪费, 输出文件跑到 uploads/
- 打包: PyInstaller one-dir, 预打包 pandoc/wkhtmltopdf/chromium

tests/test_environment.py

@@ -0,0 +1,76 @@
+"""Tests for the session environment context block (system-prompt injection)."""
+
+from __future__ import annotations
+
+import subprocess
+import sys
+
+from coworker.environment import environment_context
+
+
+def _git_repo(tmp_path):
+    ws = tmp_path / "repo"
+    ws.mkdir()
+    run = lambda *a: subprocess.run(
+        ["git", "-C", str(ws), *a], capture_output=True, check=True
+    )
+    run("init", "-q", "-b", "main")
+    run("config", "user.email", "t@t.io")
+    run("config", "user.name", "T")
+    (ws / "f.txt").write_text("1", encoding="utf-8")
+    run("add", "-A")
+    run("commit", "-qm", "first commit")
+    return ws
+
+
+def test_context_includes_workspace_platform_and_date(tmp_path):
+    block = environment_context(tmp_path)
+    assert str(tmp_path.resolve()) in block
+    assert sys.platform in block
+    assert "Today's date:" in block
+    assert "<environment>" in block and "</environment>" in block
+
+
+def test_context_outside_git_repo(tmp_path):
+    assert "not a git repository" in environment_context(tmp_path)
+
+
+def test_context_with_git_repo(tmp_path):
+    ws = _git_repo(tmp_path)
+    block = environment_context(ws)
+    assert "Git branch: main" in block
+    assert "Git status: clean" in block
+    assert "first commit" in block
+
+
+def test_context_shows_dirty_status(tmp_path):
+    ws = _git_repo(tmp_path)
+    (ws / "f.txt").write_text("2", encoding="utf-8")
+    (ws / "new.txt").write_text("x", encoding="utf-8")
+    block = environment_context(ws)
+    assert "Git status (2 changed):" in block
+    assert "f.txt" in block and "new.txt" in block
+
+
+class _Stub:
+    def complete(self, **kwargs):  # pragma: no cover
+        raise NotImplementedError
+
+    def capabilities(self, model):
+        from coworker.providers import ModelCapabilities
+
+        return ModelCapabilities()
+
+
+def test_build_engine_injects_environment(tmp_path):
+    from coworker.agent import build_engine
+    from coworker.agents import code_agent
+
+    engine = build_engine(agent=code_agent(), workspace=tmp_path, provider=_Stub())
+    try:
+        system = engine.messages[0]
+        assert system["role"] == "system"
+        assert "<environment>" in system["content"]
+        assert str(tmp_path.resolve()) in system["content"]
+    finally:
+        engine.executor.close()