docs: add workflow architecture documentation

.gitea/WORKFLOW_ARCHITECTURE.md

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+# Gitea Actions Workflow Architecture
+
+This document describes the workflow architecture for version bumping and releases.
+
+## Overview
+
+The workflow architecture uses a two-step process:
+1. **PR Workflow**: Analyzes commits and suggests bump type
+2. **Release Workflow**: Bumps version, creates tags, and builds Docker images on merge
+
+## Workflow Files
+
+### 1. `.gitea/workflows/pr.yml` (Pull Request Workflow)
+
+**Trigger**: Pull requests to `main` branch
+
+**Purpose**:
+- Run unit tests on every PR
+- Analyze commits to determine bump type (major/minor/patch)
+- Comment the suggested bump type on the PR
+
+**Bump Type Detection**:
+- **Major**: Breaking changes detected (`BREAKING CHANGE` or `!:` in commit messages)
+- **Minor**: Feature commits detected (`feat:` prefix)
+- **Patch**: Default for fixes and other changes
+
+### 2. `.gitea/workflows/release.yml` (Release Workflow)
+
+**Trigger**: Pushes to `main` branch (after PR merge)
+
+**Purpose**:
+- Determine bump type from merge commit or PR commits
+- Bump version in `package.json` and `CHANGELOG.md`
+- Commit the version bump
+- Create git tag for the release
+- Run tests inside Docker container
+- Build production Docker image
+- Push images to registry
+- Deploy to dev environment
+
+**Key Features**:
+- Skips commits that are auto-generated version bumps
+- Uses `DOCKER_LOGIN` and `DOCKER_PASSWORD` secrets for registry auth
+- Handles existing git tags gracefully
+
+## Version Bump Logic
+
+### Step 1: PR Analysis (pr.yml)
+When a PR is opened or updated:
+1. Fetch the merge base with `main`
+2. Analyze all commits in the PR
+3. Determine bump type based on commit messages:
+   - Breaking changes → major
+   - Features → minor
+   - Fixes → patch
+4. Comment the suggested bump type on the PR
+
+### Step 2: Release (release.yml)
+When a PR is merged to `main`:
+1. Check if the commit is an auto-bump (skip if so)
+2. Analyze the merge commit message or PR commits
+3. Run `node scripts/bump-version.js <type> --yes`
+4. Commit the version bump changes
+5. Create and push git tag
+6. Build and push Docker images
+
+## Environment Variables & Secrets
+
+### Required Secrets
+- `DOCKER_LOGIN`: Username for Docker registry authentication
+- `DOCKER_PASSWORD`: Password for Docker registry authentication
+- `GITEA_TOKEN` (optional): For pushing back to repo (if needed)
+
+### Environment Variables
+- `REGISTRY`: Docker registry URL (default: `docker.notsosm.art`)
+- `IMAGE_NAME`: Docker image name (default: `euchre-camp`)
+
+## Example Workflow
+
+### Scenario: Feature PR
+1. Developer opens PR with commits:
+   - "feat: add new feature"
+   - "fix: resolve edge case"
+2. PR workflow runs:
+   - Unit tests pass
+   - Bump type analysis suggests "minor"
+   - Comment posted on PR: "Suggested bump: MINOR"
+3. Developer merges PR
+4. Release workflow runs:
+   - Detects minor bump from commits
+   - Bumps version from 0.1.1 → 0.2.0
+   - Commits version bump
+   - Creates tag v0.2.0
+   - Builds and pushes Docker image
+   - Deploys to dev
+
+### Scenario: Breaking Change PR
+1. Developer opens PR with commit:
+   - "feat!: breaking API change"
+2. PR workflow runs:
+   - Detects breaking change marker
+   - Suggests "major" bump
+   - Comments on PR
+3. Developer merges PR
+4. Release workflow runs:
+   - Detects major bump
+   - Bumps version from 0.1.1 → 1.0.0
+   - Creates tag v1.0.0
+   - Proceeds with build and deploy
+
+## Benefits
+
+1. **No CI Loops**: Version bump commits are detected and skipped
+2. **Clear Communication**: PR comments inform developers of impact
+3. **Semantic Versioning**: Automated adherence to semver rules
+4. **Traceability**: Git tags and changelog reflect all changes
+5. **Safe Releases**: Tests run before version bump and deployment
+
+## Future Enhancements
+
+- Add GitHub/Gitea Release creation
+- Slack/Discord notifications on release
+- Automatic rollback on test failure
+- Multi-environment deployment (dev/staging/prod)