Milestones and review in the new loop (M2.1, PR C)

A work item starts from a fresh workspace: fetch, set aside (never
discard) leftover changes, branches and unpushed commits, a clean default
branch, and a branch of its own (D3, #62). start_milestone cuts the
milestone's branch; finish_milestone commits only the work, pushes and
opens a PR that closes the issue, under an intent, adopting an open PR and
treating a closed one as the operator's answer (D4). Between runs the
loop watches each item's PR: operator comments and inline review notes
(#69) reach the item, a merge or close hands back to the driver. A review
fix is checked after it's pushed and goes out as a new PR if the PR merged
first (D5). At boot an interrupted publish is settled against Gitea (L8).

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/items.py

@@ -18,6 +18,7 @@ CLOSED = "closed"
 # What a waiting item waits for.
 GO_AHEAD = "go-ahead"  # a go on the restatement up (L3, D1)
 ANSWER = "answer"  # an answer to a question
+MERGE = "merge"  # the PR's review and merge (D4, D5)
 
 
 @dataclass(frozen=True)
@@ -28,13 +29,23 @@ class Loop:
     rev: int = 0  # the latest proposal put up (L3)
     started: bool = False  # scope agreed: a go-ahead was given (D1)
     note: str = ""  # what a waiting item said it is waiting on
+    prepared: bool = False  # its fresh workspace was made (D3)
+    milestone: int = 0  # the current milestone (D4)
+    branch: str = ""  # the current milestone's branch, while one is open
+    pr: int = 0  # the current milestone's PR, once published
+    pr_url: str = ""
+    comments: int = 0  # the last PR conversation comment taken (L8)
+    notes: tuple[str, ...] = ()  # review notes taken (#69)
+    fixes: int = 0  # review fixes pushed, for follow-up branch names
 
     def to_data(self) -> dict[str, Any]:
         return asdict(self)
 
 
 def loop_of(item: WorkItem) -> Loop:
-    return Loop(**item.data.get("loop", {}))
+    data = dict(item.data.get("loop", {}))
+    data["notes"] = tuple(data.get("notes", ()))
+    return Loop(**data)
 
 
 def save(