Conversations on the new loop (M2.5, PR A)

- A top-level message that isn't a command is a conversation: an item in
  the `general` scope (L1), threaded under the operator's message, with
  `reply`, `ask_human` and `propose_work` and no workspace or execution.
  `general` is reserved as a project name.
- propose_work(project, title, summary) goes up as a revision for a
  go-ahead (or a plain yes). On go, under a file_issue intent (L8), the
  record issue is opened in that project, assigned to the agent and
  carrying the new item's ID; its item starts agreed, with the summary as
  its brief. Intake skips any issue carrying an ID (D1); boot adopts a
  filed issue or puts the proposal up again.
- A conversation closes after tuning.loop.general_idle_s (default a day);
  a reply in its thread then starts a new conversation that continues it.

Tests: conversation unit tests (threading, filing, the marker, an unknown
project, changes, idle close and continuation, a plain yes, both crash
cases, commands at top level); the walk with conversations, proposals and
idle time, and records_have_one_item / conversations_do_no_work; an e2e
conversation that becomes filed work.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE

nisse-dev/src/nisse_dev/loop/tools.py

@@ -66,8 +66,35 @@ WAIT_FOR_REVIEW = _tool(
     note="What you're waiting on, for the operator.",
 )
 
+# A conversation's tools (L1, L5): it talks, and may propose work.
+REPLY = _tool(
+    "reply",
+    "Answer the operator in the conversation's thread. Ends your turn; you "
+    "continue when they say more.",
+    text="Your answer, in plain language.",
+)
+PROPOSE_WORK = _tool(
+    "propose_work",
+    "The conversation has turned into work on one of the projects: propose "
+    "an issue for it. The operator agrees to it as to a restatement; then the "
+    "issue is opened, and work on it starts as its own item. Ends your turn.",
+    project="The project's name, from the list in your instructions.",
+    title="A short title for the issue.",
+    summary="What was decided, distilled: the request, what it means, and the "
+    "first step. Not the conversation; it is the issue's body and the work's "
+    "whole brief.",
+)
+
 WAITING = frozenset(
-    {"restate", "ask_human", "close_item", "finish_milestone", "wait_for_review"}
+    {
+        "restate",
+        "ask_human",
+        "close_item",
+        "finish_milestone",
+        "wait_for_review",
+        "reply",
+        "propose_work",
+    }
 )