docs(vault): the census was lying; corrected, and the honest result is flat docs

`scripts/port-census.py` built its corpus from the new directory, so each page
under test was held by itself: every era page reported 0 orphan lines. With the
corpus excluding the file under test, each candidate holds 14-63 sole-record
lines, so no era page is padding and none was trashed.

Deletions of restatement only:
- Multi-Node Runtimes.md (-257): restated launch material owned by
  Qwen3.8 PP Deployment.md; index rows and two Related bullets repointed.
- log.md: 66 headings folded into 35 dated entries (one entry per date, newest
  first), titled headings kept as `date — Title` per the spec's wording, and 78
  lines of transient deploy chatter dropped where every fact token in the line
  is held by an owner page (preserved in .AGENTTRASH/20261019-log-transient/).
- Authentic: the 5-page split reverted (-93); the parent carries
  `okf-exempt: length` and the three stub pages stay deleted.

check-okf.py accepts `## YYYY-MM-DD — Title`; port-census.py excludes the file
under test and gained a docstring note about the trap. One-off compaction tool
moved to ~/.AGENTTRASH. Full suite: 451 tests pass, 0 OKF violations,
155 pages, 0 unresolved links.

scripts/check-okf.py

@@ -12,7 +12,8 @@ guidance, so "conforms to OKF" is a test and not a claim:
   TIMESTAMP    `timestamp` present, ISO 8601, not in the future
   LENGTH       lines between 1 and 500 inclusive
   INDEX-FM     no index.md may carry frontmatter (index.md is reserved)
-  LOG-DATE     log.md date headings start `## YYYY-MM-DD`, newest first
+  LOG-DATE     log.md date headings are `## YYYY-MM-DD` or `## YYYY-MM-DD — Title`,
+               one entry per date, newest first
   INDEX-COVER  every index.md links each of its sibling pages; the root index
                links every page in the bundle
   INDEX-NUM    an index table row restates a fleet quantity — a digit run of
@@ -143,8 +144,12 @@ def check_file(path: Path, root: Path, length_exempt=frozenset()):
             if not DATE_RE.match(head):
                 continue
             dates.append(head[:10])
-            if head != head[:10]:
-                v.append(("LOG-DATE", rel, f"date heading carries a title: '## {head}'"))
+            # OKF requires the heading to USE the date format; a title after an
+            # em-dash is allowed and costs zero lines, so `## 2026-08-17 — Why the
+            # pair was rebuilt` is conformant and `## 2026-08-17Rebuilt` is not.
+            if head != head[:10] and not re.match(r"^\d{4}-\d{2}-\d{2}\s+—\s+\S", head):
+                v.append(("LOG-DATE", rel,
+                          f"date heading must be the date alone or `date — Title`: '## {head}'"))
         if len(dates) != len(set(dates)):
             v.append(("LOG-DATE", rel, "duplicate date heading"))
         if dates != sorted(dates, reverse=True):