decisions: 87, row 62 adds tracker.descendants to the host tracker entry (sage)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/plans/2026-09-26_lead-decisions.md

@@ -1841,3 +1841,19 @@ which stay with him. Each item names who decided it and what happened.
       adds the guard.
     - Projects.create is used once now, for "SetSpark" and "Launchpad"
       under #33, with no tasks.
+87. **Row 62 may add tracker.descendants to the host's tracker entry
+    (2026-10-11).** Darkwing found that `trackerFor()` in
+    `packages/cli/src/config.mjs` copies only four named tracker variables
+    into `config.trackers`. A new variable read only in the adapter would
+    leave a real `mosaic` host booting with descendants off, so the
+    feature would ship but never run. Row 62 adds the one line
+    `descendants: v["tracker.descendants"]` and updates the deepEqual
+    expectations in `packages/cli/tests/config.test.mjs` (tests 21 and 29
+    gain `descendants: false`). This is a decided scope addition, like
+    row 55's `scripts/mosaic`. The tradeoff is one more file in the
+    candidate, against a gate read that would otherwise need a packet
+    script to switch the feature on.
+    - Also recorded: a watch-only child's poll snapshot carries
+      `bucket: 0`, meaning no bucket state, since schema.sql requires an
+      integer and row A can't change packages/bus. Vikunja bucket ids
+      start at 1. Reviewers check that nothing reads 0 as a bucket.