feat(content): promote Duncarrow; build client/server artifacts

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HuHRPE7VfppUJEaoGBEUqZ

content/lore/canon-roadmap.md

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+# Canon Roadmap
+
+The world's answer to `docs/roadmap.md`: what is authored vs pending, and the
+order the Margreave is being written. Source of truth is `content/lore/*.md`;
+`content/world` + `content/server` are BUILT from it (`python -m content_build`).
+
+## Authored (status: canon)
+
+- **duncarrow.md** — Duncarrow (the Tallow Reach market town), the White Antlers
+  shrine, the Crell secret chain, and NPCs Mera Fenn (witness), Mayor Crell
+  (control), Harn Blackwood (texture). The bounded-dialogue / disposition-gate
+  specimen.
+
+## Pending (not yet authored)
+
+- The rest of the Tallow Reach region; the elven road-peoples beyond the stub
+  `faction.elves`; the seven worldbuilding topics tracked in the
+  canon-architecture direction.