content: content/* API facade + 26 tests (Phase 1 complete, 133/133)

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

plans/content-on-sx.md

@@ -19,7 +19,7 @@ injected adapter, not core.
 
 ## Status (rolling)
 
-`bash lib/content/conformance.sh` → **107/107** (Phase 1: blocks + doc + render)
+`bash lib/content/conformance.sh` → **133/133** (Phase 1 complete: blocks + doc + render + api)
 
 ## Ground rules
 
@@ -60,7 +60,7 @@ lib/content/api.sx ── (content/edit) (content/render) (content/history) ─
 - [x] `block.sx` — typed block objects
 - [x] `doc.sx` — ordered tree, apply edit op, structural moves
 - [x] `render.sx` — block tree → HTML/SX
-- [ ] `api.sx` + tests + scoreboard + conformance.sh
+- [x] `api.sx` + tests + scoreboard + conformance.sh
 
 ## Phase 2 — Op log + versioning
 - [ ] edit ops as `persist` events; replay to any version
@@ -77,6 +77,13 @@ lib/content/api.sx ── (content/edit) (content/render) (content/history) ─
 
 ## Progress log
 
+- 2026-06-07 — Phase 1 `api.sx` (**Phase 1 complete**): `content/*` facade over
+  block + doc + render. `content/bootstrap!` registers the hierarchy;
+  `content/edit` applies one op or an op stream; `content/render` picks the
+  boundary format ("html"/"sx" or keyword). Re-exports `content/new`,
+  `content/append`, `content/insert|update|move|delete`, `content/find`, etc.
+  `content/op?` distinguishes a single op from a list/block. 26 tests; suite
+  133/133. content/history deferred to Phase 2 (needs the persist op log).
 - 2026-06-07 — Phase 1 `render.sx`: render boundary as polymorphic message
   dispatch. Every block and `CtDoc` answers `asHTML` / `asSx`; the document
   folds children via Smalltalk `inject:into:` (works on raw SX lists), so