story-kit: create 319_refactor_split_workflow_rs_into_story_bug_and_test_result_modules

.story_kit/work/1_backlog/319_refactor_split_workflow_rs_into_story_bug_and_test_result_modules.md

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+---
+name: "Split workflow.rs into story, bug, and test result modules"
+---
+
+# Refactor 319: Split workflow.rs into story, bug, and test result modules
+
+## Current State
+
+- TBD
+
+## Desired State
+
+workflow.rs is 2,117 lines handling story file manipulation, bug file creation, test result reading/writing, and section replacement utilities all in one file. Split into:
+- workflow/mod.rs — shared utilities (find_story_file, replace_section_content)
+- workflow/story_ops.rs — create_story_file, update_story_in_file, story acceptance criteria operations
+- workflow/bug_ops.rs — create_bug_file, close_bug operations
+- workflow/test_results.rs — write_test_results_to_story_file, read_test_results_from_story_file, coverage operations
+- Tests split into corresponding test modules
+
+## Acceptance Criteria
+
+- [ ] workflow.rs split into focused modules under http/workflow/
+- [ ] Shared utilities remain in mod.rs and are re-exported
+- [ ] All public function signatures unchanged
+- [ ] All existing tests pass
+- [ ] No public API changes
+
+## Out of Scope
+
+- TBD