## 1. Project Scaffolding & Entry Point

- [x] 1.1 Create main.py entry point with argparse subcommand pattern
- [x] 1.2 Set up UTF-8 encoding for stdout/stderr
- [x] 1.3 Set up logging to log/adt_tools.log

## 2. SAP ADT Connection

- [x] 2.1 Implement ADTClient with HTTP Basic Auth + CSRF Token
- [x] 2.2 Support stateful/stateless session modes
- [x] 2.3 Implement context manager (`with ADTClient(...) as client:`)
- [x] 2.4 Disable SSL verification warnings

## 3. Configuration Loading

- [x] 3.1 Implement config.ini parsing with ConfigParser
- [x] 3.2 Support environment variable override (SAP_HOST, SAP_CLIENT, SAP_USER, SAP_PASSWORD)
- [x] 3.3 Support config file search order (--config → current dir → script dir)
- [x] 3.4 Default client to "100" when not specified

## 4. Object Type Registry

- [x] 4.1 Define ObjectTypeConfig with URI templates, content types, has_source flag
- [x] 4.2 Register 10 ABAP object types (report, class, interface, function, functiongroup, domain, dataelement, table, structure, tabletype)
- [x] 4.3 Implement parse_object_name for URI expansion
- [x] 4.4 Handle function type special naming (GROUP/MODULE format)
- [x] 4.5 Handle tabletype uppercase naming

## 5. Download Command

- [x] 5.1 Implement object existence check (HEAD/GET)
- [x] 5.2 Implement source code download with LF normalization
- [x] 5.3 Auto-create output directory
- [x] 5.4 Print source code preview (first 20 lines)

## 6. Sync Command

- [x] 6.1 Implement full pipeline: lock → write → unlock → syntax check → activate
- [x] 6.2 Auto-create object when not exists
- [x] 6.3 Support --corr_nr for transport request binding
- [x] 6.4 Handle lock failure with transport request selection
- [x] 6.5 Report progress per step with ✓/✗ indicators

## 7. Create Command

- [x] 7.1 Implement default template generation per type
- [x] 7.2 Support --source for custom source code
- [x] 7.3 Support --definition for DDIC JSON definitions
- [x] 7.4 Support --corr_nr for transport request in creation
- [x] 7.5 Support --path for project manifest update

## 8. Info Command

- [x] 8.1 Query object metadata via ADT GET
- [x] 8.2 Parse ADT core XML for name, type, description, status, author
- [x] 8.3 Validate response name matches request name
- [x] 8.4 Display status as ✓ 已激活 or ⚠️ 未激活

## 9. Delete Command

- [x] 9.1 Check object existence before deletion
- [x] 9.2 Require user "yes" confirmation
- [x] 9.3 Execute lock → DELETE → unlock flow
- [x] 9.4 Support --path for manifest update

## 10. Error Handling

- [x] 10.1 Define unified exception hierarchy (SapCliError base + 11 subtypes)
- [x] 10.2 Exit with code 1 and user-friendly message on SapCliError