feat(content): synthetic candidate disposition-gate specimen

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

content/lore/specimen.md

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+# SPECIMEN — format example, NOT game canon
+
+> A synthetic disposition-gate specimen: the shape a guarded-then-warm NPC and a
+> single earned personal reveal take in the bible. Authored `status: candidate`,
+> so the build VALIDATES it (`--check` resolves its gate against the ladder) but
+> emits NOTHING to `content/world` or `content/server`. This is a teaching
+> example for the world-building skill, not part of the Margreave. Do not wire
+> real content to these ids.
+
+```yaml
+id: place.specimen-wharf
+type: place
+status: candidate
+secrecy: 0
+related: []
+body: >
+  A generic river wharf, here only to anchor the specimen NPC. Not a real place
+  in the Margreave.
+```
+
+```yaml
+id: person.specimen-teague
+type: person
+status: candidate
+secrecy: 0
+related: [place.specimen-wharf]
+body: >
+  Teague, oldest hand on the wharf. Mends nets he no longer sails with. Watches
+  everything off the water and says almost none of it.
+```
+
+```yaml
+id: fact.specimen-foreign-coin
+type: fact
+status: candidate
+secrecy: 2
+related: [place.specimen-wharf, person.specimen-teague]
+body: >
+  The dock hands are paid in coin from outside the charter. Someone is buying the
+  wharf's silence, a little at a time.
+```
+
+```yaml
+id: npc.specimen-teague
+type: person
+status: candidate
+secrecy: 0
+start_disposition: cold
+related: [person.specimen-teague, fact.specimen-foreign-coin]
+body: >
+  Same man as person.specimen-teague; his interactive layer. Curt with strangers,
+  not from malice but from a lifetime of watching talkers end up face-down in the
+  river. Warms slowly, and when he does the dryness turns to something almost
+  fond.
+
+knows:
+  - {fact: fact.specimen-foreign-coin, gate: warm}
+
+disposition_notes: >
+  Starts cold. Buying his catch, not his story, is what moves him. At warm he
+  names the coin; he never speculates aloud about who mints it.
+```