Harness spec 1.1.0: one plan, prototypes and the library shared; the CLI implements it

The spec: plan_write and plan_update (new, shared, offered in every mode) and
plan_submit (now shared) keep one structured plan — findings, objectives,
phases of tasks — in place of the todo list, which lives on as a former name
of plan_write. The shared system text is one text for both projects, with
variables for what differs; the mode texts, a prototypes block and a library
block are shared. acp.md: the client hands the device what only it knows
(context, library, prototypes), the plan travels as a structure (plan_state),
library calls carry the chat's scope, and a client may rewind a session.
loop.json says its numbers as numbers. Four conformance areas: plan,
prototype, library_scope, toolcall_index.

The CLI: the plan is kept per session in the store and drawn above the prompt
and on the approval card; the prompt is assembled from the spec's texts with
their variables filled; the link reads the instance's instructions,
personalization, knowledge scope and prototype offer, sends the plan as a
structure and answers rewind; library calls to the instance carry the session
as scope; a prototype written in the terminal is saved as a file and named in
the transcript; a tool-call fragment without an index continues the last call;
the default theme is Moria; dead exports and Hermes leftovers removed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/tool/registry.ts

@@ -2,12 +2,13 @@ import { applyPatchTool } from "./apply_patch.ts"
 import { bashKillTool, bashListTool, bashOutputTool, bashTool } from "./bash.ts"
 import { editTool } from "./edit.ts"
 import { multieditTool } from "./multiedit.ts"
-import { askUserTool } from "./question.ts"
+import { askUserTool } from "./ask_user.ts"
 import { readTool } from "./read.ts"
 import { globTool, grepTool, listTool } from "./search.ts"
-import { todoTool } from "./todo.ts"
 import { viewImageTool } from "./view_image.ts"
-import { planSubmitTool } from "./plan_exit.ts"
+import { planSubmitTool } from "./plan_submit.ts"
+import { planUpdateTool } from "./plan_update.ts"
+import { planWriteTool } from "./plan_write.ts"
 import { taskTool } from "./task.ts"
 import { decisionsTool, tasksTool } from "./project_tools.ts"
 import { webFetchTool, webSearchTool } from "./web.ts"
@@ -35,7 +36,8 @@ export const BUILTIN_TOOLS: Tool[] = [
   webSearchTool,
   webFetchTool,
   taskTool,
-  todoTool,
+  planWriteTool,
+  planUpdateTool,
   tasksTool,
   decisionsTool,
   askUserTool,