nisse-review: later reviews, replies, rounds, stop and review (M7.5)

Back on a PR it reviewed: a new head gets a later review of the commits
since (each one's diff, through the API) and of its earlier points; what
was said since gets replies, answered where it was said or skipped with a
reason. It signs off once and stays quiet while still happy. Past
tuning.review.max_rounds it sums up for the operator and goes quiet,
until a push or someone other than the PR's author joins in. An
operator's `stop` quiets it; `review` asks for a fresh review.

Reviews carry numbered markers and replies their point's key, so
recovery posts nothing twice.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk

nisse-review/src/nisse_review/build.py

@@ -144,6 +144,8 @@ def build(
         attempts=tuning.review.attempts,
         ci_wait_s=tuning.review.ci_wait_s,
         ci_grace_s=tuning.review.ci_grace_s,
+        operators=config.gitea_operators,
+        max_rounds=tuning.review.max_rounds,
         patterns=config.repositories,
     )
     return Built(scheduler, account, repos, store, gitea)