docs: record upstream 0.6.x release notes

changelog.d/246.md

@@ -0,0 +1,26 @@
+### Changed
+
+- `upstream-0.6.1` was ported in #229: CONTRIBUTING routes the vendored set
+  through `docs/VENDORED.txt` — upstream#316 and upstream#311; BUILDER.md
+  scopes the green-check precondition to its act, upstream#330; RELEASES.md
+  adds the post-merge gate-member split, upstream#329 (#246).
+
+- `upstream-0.6.2` was ported in #229: BUILDER.md orders parked claims so an
+  operator-owned remainder parks the claim, never the handoff — upstream#336
+  (#246).
+
+- `upstream-0.6.3` was ported in #230: release windows read `## Members` with
+  no gate fallback, carriers leave their own gates, stale board flags stay
+  silent — upstream#343 and upstream#327 — and the parser accepts CommonMark
+  rows (#246).
+
+- Upstream logic was ported onto this forge's Forgejo-adapted issue-flow
+  reconciler, test, and CONTRIBUTING; those files were never overwritten with
+  upstream bytes (#246).
+
+- Upstream's drill-record fixes and the upstream `0.7.0`–`0.7.4` line are
+  deferred to the next sync campaign (#246).
+
+- No upstream ancestry moves in this release: `.upstream-ref` remains
+  `8c3a4d1` from upstream `0.6.0`, merged by #198; `upstream-0.6.3` is the
+  content baseline, not a merge-base (#246).