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>

harness/conformance/toolcall_index.json

@@ -0,0 +1,10 @@
+{
+  "about": "Streamed tool-call fragments reassembled into calls (quirks.json tool-call-without-index). Each delta may carry `index`, `id`, `name` and an `arguments` fragment; a delta without an index continues the last call started, and the first delta of a stream without one starts call 0. Arguments are concatenated as text, not parsed. LLeMbas: services/llm/openai_client.py; CLI: provider/openai-chat.ts ToolCallAccumulator.",
+  "cases": [
+    { "deltas": [{ "index": 0, "id": "a", "name": "read", "arguments": "{\"pa" }, { "index": 0, "arguments": "th\":\"x\"}" }], "expect": [{ "id": "a", "name": "read", "arguments": "{\"path\":\"x\"}" }] },
+    { "deltas": [{ "id": "a", "name": "read", "arguments": "{\"pa" }, { "arguments": "th\":\"x\"}" }], "expect": [{ "id": "a", "name": "read", "arguments": "{\"path\":\"x\"}" }] },
+    { "deltas": [{ "index": 0, "id": "a", "name": "read", "arguments": "{}" }, { "index": 1, "id": "b", "name": "grep", "arguments": "{\"q\":" }, { "arguments": "\"x\"}" }], "expect": [{ "id": "a", "name": "read", "arguments": "{}" }, { "id": "b", "name": "grep", "arguments": "{\"q\":\"x\"}" }] },
+    { "deltas": [{ "index": 1, "id": "b", "name": "grep", "arguments": "{}" }, { "index": 0, "id": "a", "name": "read", "arguments": "{}" }], "expect": [{ "id": "a", "name": "read", "arguments": "{}" }, { "id": "b", "name": "grep", "arguments": "{}" }] },
+    { "deltas": [{ "index": 0, "id": "a", "name": "read" }, { "index": 0, "name": "" }, { "index": 0, "arguments": "" }], "expect": [{ "id": "a", "name": "read", "arguments": "" }] }
+  ]
+}