feat: initialize Grav multi-site project

- Add AGENTS.md with project requirements and site inventory
- Add JOURNAL.md for project tracking
- Add etc-hosts-entries.txt for local testing (22 domains)
- Add setup.php for Grav multi-site routing configuration

This project migrates 21 mdbook sites to a single Grav multi-site
installation. Each site will have its own environment directory under
user/env/{fqdn}/ with independent config, pages, and themes.

Development runs in Docker on port 12000 (container: tsysstatic-dev-grav).
Production target: Cloudron Grav app at staticsites.turnsys.com.

🤖 Generated with [Crush](https://crush.cbhops.com)

Assisted-by: GLM-5 via Crush <crush@charm.land>

AGENTS.md

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+# TSYS Static Sites - Grav Multi-Site Project
+
+## Requirements
+
+### Infrastructure
+- Grav CMS multi-site installation for hosting static content
+- Currently migrating from mdbook-based sites
+- Target production: Cloudron LAMP app at staticsites.turnsys.com
+- Development: Docker container on port 12000, named with prefix `tsysstatic-dev-`
+
+### Source Content
+- 21 mdbook repositories in `/home/charles/Projects/tsysstatic/`
+- Directory name = FQDN for the site
+- All sites use standard mdbook structure (book.toml, src/, SUMMARY.md)
+
+### Multi-Site Strategy
+- Single Grav installation hosting multiple domains
+- Each site can have its own git repository for content (per-site repos preferred)
+- Use Grav's environment-based multi-site feature (user/env/{fqdn}/)
+- Domain-based routing via setup.php
+
+### Sites to Migrate
+1. governance.turnsys.com (substantial content - governance docs)
+2. plan.ap4ap.org
+3. plan.ezeda.org
+4. plan.afabn.org
+5. plan.ezpodstack.org
+6. plan.hfnoc.net
+7. plan.knownelement.com (substantial content - KNEL docs)
+8. plan.meetmorse.com
+9. plan.merchantsofhope.org
+10. plan.rackrental.net
+11. plan.redwfo.com
+12. plan.rwscp.net
+13. plan.sidedoorgroup.org
+14. plan.sol-calc.com
+15. plan.suborbital-systems.com (has chapter content)
+16. plan.teamrental.net
+17. plan.thecampustradingcompany.com
+18. plan.thepeernet.com
+19. plan.turnsys.com
+20. plan.yourdreamnamehere.com
+21. startinglineproductions.com-bizopprodplan (substantial content - STLP plans)
+
+### Development Workflow
+1. Local Docker container for development/testing
+2. /etc/hosts entries for local domain testing
+3. Git repository for Grav configuration and content
+4. Sync to Cloudron Grav instance for production
+
+### Technical Constraints
+- Use only: docker, git, and unix utilities on host
+- No AI/ML tools or language servers for file manipulation
+- Container naming: `tsysstatic-dev-*` prefix
+- Port: 12000