chore: backup before code cleanup

Backup commit before executing remove-unused-code proposal.
This includes all pending changes and new features.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/changes/archive/2025-12-10-add-ocr-processing-presets/specs/ocr-processing/spec.md

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+# OCR Processing - Delta Spec
+
+## ADDED Requirements
+
+### Requirement: REQ-OCR-PRESETS - Document Type Presets
+
+The system MUST provide predefined OCR processing configurations for common document types.
+
+Available presets:
+- `text_heavy`: Optimized for text-heavy documents (reports, articles)
+- `datasheet`: Optimized for technical datasheets
+- `table_heavy`: Optimized for documents with many tables
+- `form`: Optimized for forms and applications
+- `mixed`: Balanced configuration for mixed content
+- `custom`: User-defined configuration
+
+#### Scenario: User selects datasheet preset
+- Given a user uploading a technical datasheet
+- When they select the "datasheet" preset
+- Then the system applies conservative table parsing mode
+- And disables wireless table detection
+- And sets layout threshold to 0.65
+
+#### Scenario: User selects text_heavy preset
+- Given a user uploading a text-heavy report
+- When they select the "text_heavy" preset
+- Then the system disables table recognition
+- And focuses on text extraction
+
+### Requirement: REQ-OCR-PARAMS - Advanced Parameter Configuration
+
+The system MUST allow advanced users to configure individual PP-Structure parameters.
+
+Configurable parameters include:
+- Table parsing mode (full/conservative/classification_only/disabled)
+- Table layout threshold (0.0-1.0)
+- Wired/wireless table detection toggles
+- Layout detection model selection
+- Preprocessing options (orientation, unwarping, textline)
+- Recognition module toggles (chart, formula, seal)
+
+#### Scenario: User adjusts table layout threshold
+- Given a user experiencing table over-detection
+- When they increase table_layout_threshold to 0.7
+- Then fewer regions are classified as tables
+- And text regions are preserved correctly
+
+#### Scenario: User disables wireless table detection
+- Given a user processing a datasheet with cell explosion
+- When they disable enable_wireless_table
+- Then only bordered tables are detected
+- And structured text is not split into cells
+
+### Requirement: REQ-OCR-API - OCR Configuration API
+
+The task creation API MUST accept OCR configuration parameters.
+
+API accepts:
+- `ocr_preset`: Preset name to apply
+- `ocr_config`: Custom configuration object (overrides preset)
+
+#### Scenario: Create task with preset
+- Given an API request with ocr_preset="datasheet"
+- When the task is created
+- Then the datasheet preset configuration is applied
+- And the task processes with conservative table parsing
+
+#### Scenario: Create task with custom config
+- Given an API request with ocr_config containing custom values
+- When the task is created
+- Then the custom configuration overrides defaults
+- And the task uses the specified parameters
+
+## MODIFIED Requirements
+
+### Requirement: REQ-OCR-DEFAULTS - Default Processing Configuration
+
+The system default configuration MUST be conservative to prevent over-detection.
+
+Default values:
+- `table_parsing_mode`: "conservative"
+- `table_layout_threshold`: 0.65
+- `enable_wireless_table`: false
+- `use_doc_unwarping`: false
+
+Patch behaviors MUST be disabled by default:
+- `cell_validation_enabled`: false
+- `gap_filling_enabled`: false
+- `table_content_rebuilder_enabled`: false
+
+#### Scenario: New task uses conservative defaults
+- Given a task created without specifying OCR configuration
+- When the task is processed
+- Then conservative table parsing is used
+- And wireless table detection is disabled
+- And no post-processing patches are applied