docs(01-01): complete plugin structure plan

Tasks completed: 2/2
- Create main plugin file with header
- Create main plugin class with activation/deactivation

SUMMARY: .planning/phases/01-foundation-setup/01-01-SUMMARY.md

.planning/phases/01-foundation-setup/01-01-SUMMARY.md

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+# Phase 1 Plan 1: Plugin Structure Summary
+
+**WordPress plugin boilerplate created with activation/deactivation hooks**
+
+## Accomplishments
+
+- Main plugin file with proper header and constants
+- Singleton pattern for main class
+- Activation with version/PHP/WP checks
+- Deactivation with rewrite flush
+- Security checks on all files
+
+## Files Created/Modified
+
+- `ddhh-job-manager.php` - Main plugin file with header
+- `includes/class-ddhh-job-manager.php` - Main singleton class
+- `includes/class-activator.php` - Activation logic with checks
+- `includes/class-deactivator.php` - Deactivation logic
+
+## Decisions Made
+
+- Used class prefix instead of namespace for WordPress compatibility
+- Singleton pattern for main class (WordPress convention)
+- Flush rewrites via transient to avoid multiple flushes
+
+## Issues Encountered
+
+None
+
+## Next Step
+
+Ready for 01-02-PLAN.md (can run in parallel)