fix(session-split): exclude archived pages from taken topics

CHANGELOG.md

@@ -106,6 +106,10 @@ All notable changes to vouch are documented here. Format follows
   artifact the caller could not already retrieve, and it touches no write path.
 
 ### Fixed
+- **session-split ignores archived pages in TAKEN TOPICS / collisions** (#712):
+  prompts and `_file_drafts` treated every on-disk page as taken, so archiving
+  a session summary permanently blocked redraft under the same title. Both
+  now reuse `compile._live_pages` (same live set as compile post-#700).
 - **`kb.neighbors` drops archived pages** (#696):
   `_neighbor_ok` already filtered retracted claims but accepted any
   on-disk page, so archived titles still appeared in neighbors while

src/vouch/session_split.py

@@ -368,7 +368,7 @@ def build_split_prompt(
     if git_stat:
         lines += ["GIT STAT:", "```", git_stat, "```", ""]
 
-    pages = store.list_pages()
+    pages = compile_mod._live_pages(store)
     pending = compile_mod._pending_page_names(store)
     taken = [f"- {p.title}" for p in pages] + [f"- {n} [pending]" for n in sorted(pending)]
     lines += ["TAKEN TOPICS (do NOT redraft any of these):"]
@@ -434,7 +434,7 @@ def build_renarrate_prompt(store: KBStore, body: str, *, title: str, max_pages:
     if title:
         lines += [f"SESSION RECORD TITLE: {title}", ""]
     lines += ["SESSION RECORD (markdown):", body, ""]
-    pages = store.list_pages()
+    pages = compile_mod._live_pages(store)
     pending = compile_mod._pending_page_names(store)
     taken = [f"- {p.title}" for p in pages] + [f"- {n} [pending]" for n in sorted(pending)]
     lines += ["TAKEN TOPICS (do NOT redraft any of these):"]
@@ -492,7 +492,7 @@ def _file_drafts(
     max_pages: int,
     origin: Path | None = None,
 ) -> tuple[list[str], list[dict[str, Any]]]:
-    existing = store.list_pages()
+    existing = compile_mod._live_pages(store)
     taken = {p.title.strip().lower() for p in existing}
     taken |= {p.id.strip().lower() for p in existing}
     taken |= compile_mod._pending_page_names(store)

tests/test_session_split_renarrate.py

@@ -21,7 +21,7 @@
 from vouch import capture, session_split
 from vouch import compile as compile_mod
 from vouch.llm_draft import LLMDraftError
-from vouch.models import Page, Proposal, ProposalKind, ProposalStatus
+from vouch.models import Page, PageStatus, Proposal, ProposalKind, ProposalStatus
 from vouch.session_split import SPLIT_ACTOR, SplitConfig, load_split_config
 from vouch.storage import KBStore
 
@@ -154,6 +154,36 @@ def test_renarrate_prompt_lists_durable_and_pending_topics(
         assert "- retrieval backends [pending]" in prompt
 
 
+def test_renarrate_prompt_and_file_drafts_ignore_archived_pages(
+    store: KBStore,
+) -> None:
+    """Archived pages must not block TAKEN TOPICS or draft collision (#712)."""
+    store.put_page(Page(
+        id="archived-session-topic",
+        title="retired session topic XYZ",
+        status=PageStatus.ARCHIVED,
+    ))
+    store.put_page(Page(
+        id="live-topic",
+        title="landed the review gate",
+        status=PageStatus.ACTIVE,
+    ))
+    prompt = session_split.build_renarrate_prompt(
+        store, "body", title="t", max_pages=3,
+    )
+    assert "retired session topic XYZ" not in prompt
+    assert "landed the review gate" in prompt
+
+    ids, dropped = session_split._file_drafts(
+        store,
+        "s-arch",
+        [{"title": "retired session topic XYZ", "body": "rewrote the retired topic"}],
+        max_pages=3,
+    )
+    assert len(ids) == 1
+    assert dropped == []
+
+
 # --- _try_renarrate ------------------------------------------------------