fix(orchestrator): A2+A3 set agent container cwd to workspace path

Smoke run 3 surfaced two bugs that share a root cause:
  - Edit(/app/README.md) → 'Edit exists but is not enabled in this context'
  - commit(files=['/app/README.md']) → 'outside repository at <workspace>'

Both happened because the container's WORKDIR is /app (roboco package
source) while the agent's task workspace is bind-mounted at
/data/workspaces/<project>/<team>/<agent>/. The Dev role's
Edit/Write permission allowlist scopes to the workspace, so any Edit
call from /app fails the path match.

Adds '-w {workspace_path}' to the docker run command so the container
starts with cwd = task workspace. Edit(README.md) and git add README.md
now resolve inside the workspace clone.

Mirrors _get_role_permissions path selection exactly:
  - developer / product_owner / head_marketing: per-agent workspace
  - documenter: cell workspace (matches its Write/Edit allowlist)
  - qa / cell_pm / main_pm / auditor: omit -w, fall back to /app

Spec ref: docs/superpowers/specs/2026-05-12-post-smoke-3-fixes-design.md
sections A2 + A3 (re-scoped per investigation 2026-05-12).

tests/unit/runtime/test_spawn_cwd_workspace.py

@@ -0,0 +1,166 @@
+"""Wave A2+A3 (2026-05-12): agent container cwd is set to the workspace path
+so Edit(README.md) and git add README.md resolve inside the workspace clone.
+
+Smoke run 3 showed Edit failing with 'Edit exists but is not enabled in this
+context' and commit failing with 'outside repository at <workspace>' — both
+caused by the container WORKDIR being /app (the roboco package) instead of
+the agent's task workspace.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+from unittest.mock import patch
+
+from roboco.models.runtime import OrchestratorAgentConfig, SpawnGitContext
+from roboco.runtime.orchestrator import AgentOrchestrator
+
+
+def _make_dev_config(*, project_slug: str = "roboco-api") -> OrchestratorAgentConfig:
+    """Minimal AgentConfig for be-dev-1 with a known project slug."""
+    return OrchestratorAgentConfig(
+        agent_id="be-dev-1",
+        blueprint_path=Path("/app/agents/blueprints/be-dev-1.md"),
+        model="sonnet",
+        mcp_config_path=Path("/app/mcp-config.json"),
+        git_context=SpawnGitContext(
+            project_slug=project_slug,
+            branch_name="feature/backend/TASK0001",
+        ),
+    )
+
+
+def _make_cell_pm_config(
+    *, project_slug: str = "roboco-api"
+) -> OrchestratorAgentConfig:
+    """Minimal AgentConfig for be-pm (cell_pm role) — no per-agent workspace."""
+    return OrchestratorAgentConfig(
+        agent_id="be-pm",
+        blueprint_path=Path("/app/agents/blueprints/be-pm.md"),
+        model="sonnet",
+        mcp_config_path=Path("/app/mcp-config.json"),
+        git_context=SpawnGitContext(project_slug=project_slug),
+    )
+
+
+def _make_documenter_config(
+    *, project_slug: str = "roboco-api"
+) -> OrchestratorAgentConfig:
+    """Minimal AgentConfig for be-doc (documenter role)."""
+    return OrchestratorAgentConfig(
+        agent_id="be-doc",
+        blueprint_path=Path("/app/agents/blueprints/be-doc.md"),
+        model="haiku",
+        mcp_config_path=Path("/app/mcp-config.json"),
+        git_context=SpawnGitContext(project_slug=project_slug),
+    )
+
+
+def _minimal_hosts() -> dict[str, str | None]:
+    """Minimal host-paths dict that satisfies _build_mount_args without real FS."""
+    return {
+        "claude": "/home/runner/.claude",
+        "blueprints": "/app/agents/blueprints",
+        "docs": "/app/docs",
+        "workspaces": "/data/workspaces",
+        "mcp_config": "/app/mcp-config.json",
+        "prompt": "/app/system-prompt.md",
+        "settings": None,
+        "briefing": None,
+    }
+
+
+def _mock_settings() -> dict[str, object]:
+    """Attribute dict for patched settings object."""
+    return {
+        "agent_tool_call_warn": 80,
+        "agent_tool_call_halt": 100,
+        "agent_loop_threshold": 5,
+        "agent_loop_window": 10,
+        "agent_stop_attempt_allowance": 2,
+        "manifest_host_dir": "/tmp/manifests",
+        "workspaces_root": "/data/workspaces",
+    }
+
+
+def _build_cmd(container_name: str, config: OrchestratorAgentConfig) -> list[str]:
+    """Call _build_mount_args with all external I/O patched out."""
+    hosts = _minimal_hosts()
+    attrs = _mock_settings()
+    with (
+        patch("roboco.runtime.orchestrator.settings") as mock_settings,
+        patch("roboco.runtime.orchestrator.Path.exists", return_value=False),
+        patch(
+            "roboco.runtime.orchestrator._build_manifest_for_agent",
+            return_value=None,
+        ),
+    ):
+        for k, v in attrs.items():
+            setattr(mock_settings, k, v)
+        return AgentOrchestrator._build_mount_args(container_name, config, hosts)
+
+
+class TestDeveloperSpawnCwdWorkspace:
+    """Developer container must start in the agent's task workspace."""
+
+    def test_cmd_contains_workdir_flag(self) -> None:
+        """docker run for a developer includes -w <workspace_path>."""
+        config = _make_dev_config(project_slug="roboco-api")
+        cmd = _build_cmd("roboco-agent-be-dev-1", config)
+
+        assert "-w" in cmd, f"'-w' flag missing from docker run cmd: {cmd}"
+        w_idx = cmd.index("-w")
+        workdir = cmd[w_idx + 1]
+        # Developer workspace: /data/workspaces/<project>/<team>/<agent>
+        expected = "/data/workspaces/roboco-api/backend/be-dev-1"
+        assert workdir == expected, (
+            f"Expected workdir '{expected}' but got '{workdir}'. "
+            f"Full cmd: {cmd}"
+        )
+
+    def test_workdir_matches_edit_allowlist_path(self) -> None:
+        """The -w value matches the Edit({workspace_path}/**) allowlist prefix."""
+        config = _make_dev_config(project_slug="my-project")
+        cmd = _build_cmd("roboco-agent-be-dev-1", config)
+
+        w_idx = cmd.index("-w")
+        workdir = cmd[w_idx + 1]
+        # Allowlist in _get_role_permissions: Edit({workspace_path}/**)
+        # workdir must equal that workspace_path
+        assert workdir == "/data/workspaces/my-project/backend/be-dev-1"
+
+
+class TestCellPmSpawnCwdNoWorkdir:
+    """cell_pm containers must NOT get a -w flag (no per-agent write workspace)."""
+
+    def test_cmd_does_not_contain_workdir_flag(self) -> None:
+        """docker run for a cell_pm omits -w so container falls back to /app."""
+        config = _make_cell_pm_config(project_slug="roboco-api")
+        cmd = _build_cmd("roboco-agent-be-pm", config)
+
+        assert "-w" not in cmd, (
+            "cell_pm should not have '-w' in docker run cmd "
+            f"(would shadow /app Dockerfile WORKDIR): {cmd}"
+        )
+
+
+class TestDocumenterSpawnCwdCellWorkspace:
+    """Documenter container must start in the cell-workspace path."""
+
+    def test_cmd_contains_cell_workspace_workdir(self) -> None:
+        """docker run for a documenter uses -w <cell_workspace_path>."""
+        config = _make_documenter_config(project_slug="roboco-api")
+        cmd = _build_cmd("roboco-agent-be-doc", config)
+
+        # Documenter allowlist scopes to cell_workspace_path:
+        # /data/workspaces/<project>/<team>
+        assert "-w" in cmd, (
+            f"'-w' flag missing from documenter docker run cmd: {cmd}"
+        )
+        w_idx = cmd.index("-w")
+        workdir = cmd[w_idx + 1]
+        expected = "/data/workspaces/roboco-api/backend"
+        assert workdir == expected, (
+            f"Expected documenter workdir '{expected}' but got '{workdir}'. "
+            f"Full cmd: {cmd}"
+        )