bug(index): plan permission mode missing from PermissionModeEnum; tests assert wrong tool names

[apex-skyner]

Problems

1. Missing plan permission mode

The dev-agent-routing skill (and the plugin README) document permission_mode: "plan" for plan-approval workflows, but the current PermissionModeEnum only accepts "bypassPermissions" and "default". Passing plan causes a schema validation error.

// current
const PermissionModeEnum = Type.Union([
  Type.Literal('bypassPermissions'),
  Type.Literal('default'),
]);

Should also include Type.Literal('plan') and pass --permission-mode plan to Claude Code.

2. Stale/broken test fixture

src/index.test.ts asserts:

expect(getToolPluginMetadata(entry)?.tools.map((tool) => tool.name)).toEqual(["echo"]);

But the plugin exports 7 tools: agent_launch, agent_output, agent_respond, agent_sessions, agent_kill, agent_merge, agent_pr. The test is completely wrong and always fails.

3. Missing worktree_pr_target_repo parameter

The dev-agent-routing skill calls:

agent_launch(
  ...
  worktree_pr_target_repo: '<owner>/<repo>'  # for fork workflows
)

This parameter is not declared in the plugin schema so it is silently ignored.

Fix

• Add plan to PermissionModeEnum and handle it with --permission-mode plan in arg building
• Fix the test to assert the correct 7-tool list
• Add worktree_pr_target_repo optional string parameter to agent_launch