feat(board): split the age column, so a silent repo cannot hide behind a fresh plan

ALDER carried two readings depending on which branch a repo fell into: STATE.md
mtime for repos that had one, last-commit age for repos that did not. The
consequence was one-sided -- a repo WITH a STATE.md reported only how recently
its plan was touched, so one that had not committed in a year looked exactly as
alive as one worked on this morning, and no column contradicted it.

Now each column means one thing. ALDER is the plan's age and is blank where
there is no plan; SISTE is the last commit, read for every repo, and blank where
there are no commits -- a day count there would be a fabricated reading, which
is what the old -1d was.

The four ranking rules stay four: the new column is evidence, never sort input.
The sort key was already a separate field from the displayed age, so bucket 5
keeps ordering by commit age while showing nothing in ALDER.

The fixture tree was missing the only case that discriminates -- a repo with a
STATE.md AND an old last commit -- so the checks land with it, plus its mirror
image (old plan, fresh commit) to pin that the two ages read independently and
that neither became the sort key. Backdating sets GIT_COMMITTER_DATE, not
--date=: %ct is the committer date, and an author-only backdate would have left
the red test failing for the wrong reason.

board-selftest: 30 -> 36 checks.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QS6gYYgYgJAz7VjcFHEzbb

scripts/board.sh

@@ -8,6 +8,7 @@
 #   STATE.md "NESTE" block   - the next step, per repo (canonical)
 #   STATE.md board line      - optional machine-readable field (see below)
 #   git status --porcelain   - uncommitted risk
+#   git log -1 --format=%ct  - when anything last landed (the SISTE column)
 #   ~/.claude/coord/<repo>/inbox - UNHANDLED INBOUND: others addressed this
 #                              repo and it has not processed them. This is an
 #                              obligation the repo owes outward - NOT evidence
@@ -32,6 +33,15 @@
 #              shows the form only. `route.sh --help` is the authority; the two
 #              ends are pinned together by route-selftest.sh section 6.
 #
+# TWO AGE COLUMNS, ONE MEANING EACH. ALDER is the STATE.md mtime - when the
+# plan was last touched - and is blank for a repo that has none. SISTE is the
+# last commit, read for every repo. They were one column once, and it meant
+# whichever of the two the repo's branch happened to compute: a repo WITH a
+# STATE.md showed only its plan's age, so one that had not committed in a year
+# was indistinguishable from one worked on this morning. Both are evidence for
+# the reader and neither is a ranking input - the buckets and the sort are
+# unchanged by this column.
+#
 # ATTENTION AXIS, NOT A TOPIC AXIS. This status vocabulary is deliberately NOT
 # the vocabulary a cross-repo TOPIC register uses. A topic register answers
 # "what is this repo's status on subject X (has it adopted convention Y?)";
@@ -123,11 +133,23 @@ printf '%s\n' "$REPOS" | while IFS= read -r d; do
     [ -n "$inbox" ] || inbox=0
   fi
 
+  # Read for EVERY repo, not just the STATE-less ones: a repo whose plan file
+  # is fresh can still have been silent for a year, and that is precisely the
+  # repo no other column reports. A repo with no commits at all has no reading
+  # to give - printing a day count there would be a fabricated one.
+  lastct="$(git -C "$d" log -1 --format=%ct 2>/dev/null)"
+  if [ -n "$lastct" ]; then
+    lastd=$(( (NOW - lastct) / 86400 )); lastcol="${lastd}d"
+  else
+    lastd=-1; lastcol="-"
+  fi
+
   if [ ! -f "$state" ]; then
-    last="$(git -C "$d" log -1 --format=%ct 2>/dev/null)"
-    if [ -n "$last" ]; then age=$(( (NOW - last) / 86400 )); else age=-1; fi
-    printf '5|%06d|%s|-|-|%s|%s|%sd|(ingen STATE.md)\n' \
-      "$age" "$name" "$inbox" "$dirty" "$age"
+    # No plan file, so no plan age: ALDER is blank rather than quietly showing
+    # the commit age under a heading that means something else everywhere else
+    # in the table. The sort key keeps using it - order is unchanged.
+    printf '5|%06d|%s|-|-|%s|%s|-|%s|(ingen STATE.md)\n' \
+      "$lastd" "$name" "$inbox" "$dirty" "$lastcol"
     continue
   fi
 
@@ -185,8 +207,8 @@ printf '%s\n' "$REPOS" | while IFS= read -r d; do
     *)            bucket=2 ;;
   esac
 
-  printf '%s|%06d|%s|%s|%s|%s|%s|%sd|%s\n' \
-    "$bucket" "$age" "$name" "$disp" "$cost" "$inbox" "$dirty" "$age" "$neste"
+  printf '%s|%06d|%s|%s|%s|%s|%s|%sd|%s|%s\n' \
+    "$bucket" "$age" "$name" "$disp" "$cost" "$inbox" "$dirty" "$age" "$lastcol" "$neste"
 done > "${TMPDIR:-/tmp}/board.$$"
 
 RECORDS="${TMPDIR:-/tmp}/board.$$"
@@ -194,15 +216,15 @@ trap '/bin/rm -f "$RECORDS" 2>/dev/null' EXIT
 
 hdr() {
   printf '\n%s\n' "$1"
-  printf '%-32s %-34s %-14s %4s %4s %6s  %s\n' \
-    "REPO" "STATUS" "KOST" "INN" "DRT" "ALDER" "NESTE"
+  printf '%-32s %-34s %-14s %4s %4s %6s %6s  %s\n' \
+    "REPO" "STATUS" "KOST" "INN" "DRT" "ALDER" "SISTE" "NESTE"
 }
 
 rows() {
   awk -F'|' -v b="$1" '$1==b' "$RECORDS" | sort -t'|' -k2,2n | \
-  while IFS='|' read -r bucket sortkey name status cost inbox dirty age neste; do
-    printf '%-32s %-34s %-14s %4s %4s %6s  %s\n' \
-      "$name" "$status" "$cost" "$inbox" "$dirty" "$age" "$neste"
+  while IFS='|' read -r bucket sortkey name status cost inbox dirty age last neste; do
+    printf '%-32s %-34s %-14s %4s %4s %6s %6s  %s\n' \
+      "$name" "$status" "$cost" "$inbox" "$dirty" "$age" "$last" "$neste"
   done
 }
 
@@ -210,6 +232,7 @@ count() { awk -F'|' -v b="$1" '$1==b' "$RECORDS" | wc -l | tr -d ' '; }
 
 echo "BOARD - tverr-repo oppmerksomhetstavle ($(awk 'END{print NR}' "$RECORDS") repo)"
 echo "INN = uhaandtert innboks (andre venter paa DEG). DRT = ukommiterte filer."
+echo "ALDER = dager siden STATE.md endret. SISTE = dager siden siste commit."
 
 [ "$(count 1)" -gt 0 ] && { hdr "BLOKKERT (venter paa ekstern avhengighet)"; rows 1; }
 [ "$(count 2)" -gt 0 ] && { hdr "AKTIV (reelt neste steg)"; rows 2; }