docs: update README and AGENTS.md with CI/CD and justfile info

AGENTS.md

@@ -109,10 +109,50 @@ npm run db:setup-postgres
 **Note:** The database provider is automatically detected by Better Auth and Prisma.
 
 ### Running Tests
+
+**Using just (recommended):**
+- **All tests**: `just test` (unit + acceptance with SQLite)
+- **Unit tests**: `just test-unit`
+- **Acceptance tests (SQLite)**: `just test-acceptance-sqlite`
+- **Acceptance tests (PostgreSQL)**: `just test-acceptance-postgres`
+- **PR validation**: `just pr-validate` (what runs on pull requests)
+
+**Using npm scripts:**
 - **Unit tests**: `npm run test`
 - **Acceptance tests**: `npm run test:acceptance`
 - **Specific test**: `npm run test:acceptance -- --grep "test name"`
 
+**CI-style acceptance tests with SQLite:**
+```bash
+DATABASE_PROVIDER=sqlite DATABASE_URL=file:./prisma/ci.db npm run test:acceptance
+```
+
+### CI/CD Pipeline
+The project uses Gitea Actions for continuous integration:
+
+**PR Workflow** (`.gitea/workflows/pr.yml`):
+- Runs on pull requests to main
+- Executes unit tests and acceptance tests with SQLite
+- Analyzes commits for semantic versioning
+- Comments suggested bump type on PRs
+
+**Test Workflow** (`.gitea/workflows/test.yml`):
+- Runs on all branch pushes
+- Executes unit tests for quick feedback
+- Skips auto-generated version bump commits
+
+**Release Workflow** (`.gitea/workflows/release.yml`):
+- Runs on main branch pushes
+- Determines version bump type
+- Bumps version and creates git tags
+- Builds Docker images and runs tests
+- Pushes to registry and deploys
+
+**Database Strategy**:
+- CI tests use SQLite (fast, no server required)
+- Production uses PostgreSQL
+- Switch with `DATABASE_PROVIDER` environment variable
+
 ## Key Files
 
 ### Configuration
@@ -170,6 +210,10 @@ npm run db:setup-postgres
 - Utilities: camelCase (e.g., `elo-utils.ts`)
 - Tests: `.test.ts` or `.test.tsx` suffix
 
+## File Organization
+
+See [docs/FILE_ORGANIZATION.md](docs/FILE_ORGANIZATION.md) for detailed file organization and structure.
+
 ## Resources
 
 - **Better Auth Docs**: https://better-auth.com/docs