The Claude Code plugin's /forge gains `plan`: show the planner's wave and nod or redirect it #5321

For: the owner steers the plan from Claude Code in one line — the planner proposes a wave, the owner nods or redirects.

Done:

• [ ] plugins/claude-code/commands/forge.md: argument-hint and the body gain plan [approve|redirect <words>|later]: call asks, take the first wave-proposal row, show it in three lines; approve/redirect/later call asks_proposal with that row, and only after the person says yes.
• [ ] plugin.json's description names plan; plugins/claude-code/README.md says how to use it.
• [ ] test/plugins.test.ts gains a case that the command names every MCP tool it tells the model to call, and every one exists in src/http/mcp.ts's tool list; it fails if a name is wrong.

Files: plugins/claude-code/commands/forge.md, plugins/claude-code/.claude-plugin/plugin.json, plugins/claude-code/README.md, test/plugins.test.ts. Risk: keep it thin — no logic beyond naming tools.