docs: add implementation plan, ADRs, and task tracking system

- Add comprehensive 8-phase implementation plan (docs/plan.md)
- Add 28 Architecture Decision Records (docs/adr/) covering all phases
- Add task tracking system with 283+ task files (docs/stories/)
- Add task generator script for automated task file creation
- Add reference playbooks and requirements documentation

This commit establishes the complete planning foundation for the Go
Platform implementation, documenting all architectural decisions and
providing detailed task breakdown for Phases 0-8.

docs/stories/TASK_TEMPLATE.md

@@ -0,0 +1,54 @@
+# Task Template
+
+Use this template for creating new task files.
+
+## Metadata
+- **Task ID**: {phase}.{section}.{subtask}
+- **Title**: {Descriptive Task Name}
+- **Phase**: {Phase Number} - {Phase Name}
+- **Section**: {Section Number}.{Section Name}
+- **Status**: Pending | In Progress | Completed | Blocked
+- **Priority**: High | Medium | Low
+- **Estimated Time**: {time estimate}
+- **Dependencies**: {task IDs that must complete first}
+
+## Description
+{Clear description of what needs to be done}
+
+## Requirements
+- {Requirement 1}
+- {Requirement 2}
+- {Requirement 3}
+
+## Implementation Steps
+1. {Step 1}
+2. {Step 2}
+3. {Step 3}
+
+## Acceptance Criteria
+- [ ] {Criterion 1}
+- [ ] {Criterion 2}
+- [ ] {Criterion 3}
+
+## Related ADRs
+- [ADR-XXXX: {ADR Title}](../../adr/XXXX-adr-title.md)
+
+## Implementation Notes
+- {Note 1}
+- {Note 2}
+- {Note 3}
+
+## Testing
+```bash
+# Test commands
+go test ./...
+```
+
+## Files to Create/Modify
+- `path/to/file.go` - {Description}
+- `path/to/file_test.go` - {Description}
+
+## References
+- {Link to relevant documentation}
+- {Link to example code}
+