content: document statistics (stats.sx) + 17 tests (433/433)

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` → **416/416** (Phases 1–4 COMPLETE + 10 extensions: HTML/SX escaping, Markdown render+import, CRDT replication, tree-aware validation, snapshot cache, doc metadata, plain-text render, nested block trees)
+`bash lib/content/conformance.sh` → **433/433** (Phases 1–4 COMPLETE + 11 extensions: HTML/SX escaping, Markdown render+import, CRDT replication, tree-aware validation, snapshot cache, doc metadata, plain-text render, nested block trees, doc stats)
 
 ## Ground rules
 
@@ -86,9 +86,15 @@ lib/content/api.sx ── (content/edit) (content/render) (content/history) ─
 - [x] document metadata (`meta.sx`: title/slug/tags + Ghost title plumbing)
 - [x] plain-text render + excerpt (`text.sx`: asText, content/excerpt)
 - [x] nested block trees (`section.sx`: CtSection container, recursive render, deep-find)
+- [x] document statistics (`stats.sx`: word/char/block counts, reading time)
 
 ## Progress log
 
+- 2026-06-07 — Extension: document statistics (`stats.sx`). `content/stats`
+  returns `{:words :chars :blocks :reading-minutes}`; word/char counts derive
+  from the tree-accurate `asText` projection, block count from an inline tree
+  walk (no section.sx dep), reading time at 200 wpm rounded up. Counts descend
+  into nested sections. 17 tests; suite 433/433.
 - 2026-06-07 — Refinement: tree-aware validation. `validate.sx` now flattens the
   whole block tree (descending into `CtSection` children, guarding malformed
   non-list children) so field checks and duplicate-id detection cover nested