artdag: mark push-blocker resolved (loops/artdag pushed to origin)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plans/artdag-on-sx.md

@@ -49,10 +49,9 @@ of `origin/architecture` (the Phase 7 chain `657d8061..4a02a9c4` + the architect
   branch already absorbed architecture, so `lib/artdag/**` + this plan are purely additive.
 - **Target is LOCAL architecture** (146 ahead of `origin/architecture`, which is kept
   deliberately stale), matching how other loops landed.
-- **BLOCKED on push first:** the 5 newest commits (`1fd3aea8..4a02a9c4`) are local-only —
+- **Pushed (2026-06-28):** `loops/artdag` is now on `origin` through `cd2ad707` (credential
-  push to `origin/loops/artdag` is broken in this worktree (empty `~/.git-credentials`).
+  restored). It is 10 commits ahead of `origin/architecture`. A maintainer does the merge
-  Restore the credential, push, then a maintainer does the merge (the loop agent must NOT
+  (the loop agent must NOT touch `architecture` itself).
-  touch `architecture` itself).
 
 ## Ground rules
 
@@ -393,11 +392,8 @@ be an op token.
 
 ## Blockers
 
-- **Push to `origin/loops/artdag` unavailable in this environment** (since 2026-06-19).
+- ~~**Push to `origin/loops/artdag` unavailable**~~ — RESOLVED 2026-06-28: credential
-  `git push` fails `could not read Username for 'https://git.rose-ash.com'` —
+  restored in `~/.git-credentials`, push works; `loops/artdag` pushed through `cd2ad707`.
-  `~/.git-credentials` is empty; fetch/`ls-remote` work (anonymous read) but push needs
-  auth. Commits accumulate locally (HEAD ahead of `origin/loops/artdag`); push when
-  credentials are restored. Environment issue, not a code blocker.
 - **sx-tree edit tools raise yojson `"Expected string, got null"` in this worktree**
   (`sx_insert_near`/`sx_replace_*`/`sx_insert_child`). Only `sx_write_file` works for
   writes; assemble the full file and `sx_write_file` (or `cp` a prepared file +