init: CIVICVS repository — CBPs, corpus standard, directory structure

- README.md: project identity, TESSERA relationship, directory layout
- CIVICVS-CBPs.md: CBP-001 through CBP-006 adapted for CIVICVS
- docs/corpus/mesolithic-corpus-standard-v1.md: 10-table schema, 6-sprint plan, 25 seed concepts
Per CBP-001: committed same session as produced.

README.md

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+# CIVICVS
+
+Mesolithic narrative simulator built on TESSERA spatial data.
+Set in approximately 8000 BCE, Spree-Havel river valley, Berlin.
+
+---
+
+## Relationship to TESSERA
+
+CIVICVS is a separate project from TESSERA. They share infrastructure
+and the TESSERA SpatiaLite database is the spatial ground truth for
+CIVICVS, but they have separate repositories, separate RFC stacks,
+and separate failure modes. Do not confuse them.
+
+TESSERA repository: `https://gitea.barternetwork.us/TheRON/tesserav3`
+CIVICVS repository:  `https://gitea.barternetwork.us/TheRON/civicvs`
+
+---
+
+## Read before doing anything
+
+1. `CIVICVS-CBPs.md` — session continuity and commit discipline. Non-negotiable.
+2. `docs/corpus/mesolithic-corpus-standard-v1.md` — corpus schema and workflow.
+3. `repo/docs/sessions/` — most recent session log first.
+
+---
+
+## Repository layout
+
+```
+docs/
+  corpus/
+    mesolithic-corpus-standard-v1.md   Corpus schema, sprint plan, seed concepts
+  decisions/                           Architecture decision records
+repo/
+  docs/
+    sessions/                          Session logs — raw, committed same day
+  pipeline/
+    scripts/                           Pipeline scripts
+```
+
+---
+
+## Active branch: dev
+
+Direct push to `dev` allowed.
+`main` and `staging` are protected — PR only.
+
+---
+
+*CIVICVS — founded 2026-04-18*
+*The process is the project.*