chore: remove stories/checker backend dead code

Remove the dead stories/checker backend tracked as design debt in CLAUDE.md:
- Delete internal/api/stories.go, stories_test.go, elaborate.go
- Delete internal/task/story.go, story_test.go
- Remove story/checker columns from storage schema and all CRUD methods
- Remove checkStoryCompletion, spawnCheckerTask, triggerStoryDeploy,
  createValidationTask, checkValidationResult, ShipStory, CheckStoryCompletion
  from executor; simplify handleRunResult
- Remove story/checker fields from task.Task (StoryID, AcceptanceCriteria,
  CheckerForTaskID, CheckerReport)
- Remove story routes and geminiBinPath from API server
- Move claudeJSONResult/extractJSON from elaborate.go to validate.go
- Rename ensureStoryBranch -> ensureBranch in ContainerRunner
- Fix git identity in bare-repo tests; fix initial-branch to use main

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 0 insertions, 41 deletions

diff --git a/internal/task/story.go b/internal/task/story.go
deleted file mode 100644
index 536bda1..0000000
--- a/internal/task/story.go
+++ /dev/null
@@ -1,41 +0,0 @@
-package task
-
-import "time"
-
-type StoryState string
-
-const (
-	StoryPending     StoryState = "PENDING"
-	StoryInProgress  StoryState = "IN_PROGRESS"
-	StoryShippable   StoryState = "SHIPPABLE"
-	StoryDeployed    StoryState = "DEPLOYED"
-	StoryValidating  StoryState = "VALIDATING"
-	StoryReviewReady StoryState = "REVIEW_READY"
-	StoryNeedsFix    StoryState = "NEEDS_FIX"
-)
-
-type Story struct {
-	ID             string     `json:"id"`
-	Name           string     `json:"name"`
-	ProjectID      string     `json:"project_id"`
-	BranchName     string     `json:"branch_name"`
-	DeployConfig   string     `json:"deploy_config"`
-	ValidationJSON string     `json:"validation_json"`
-	Status         StoryState `json:"status"`
-	CreatedAt      time.Time  `json:"created_at"`
-	UpdatedAt      time.Time  `json:"updated_at"`
-}
-
-var validStoryTransitions = map[StoryState]map[StoryState]bool{
-	StoryPending:     {StoryInProgress: true},
-	StoryInProgress:  {StoryShippable: true, StoryNeedsFix: true},
-	StoryShippable:   {StoryDeployed: true},
-	StoryDeployed:    {StoryValidating: true},
-	StoryValidating:  {StoryReviewReady: true, StoryNeedsFix: true},
-	StoryReviewReady: {},
-	StoryNeedsFix:    {StoryInProgress: true},
-}
-
-func ValidStoryTransition(from, to StoryState) bool {
-	return validStoryTransitions[from][to]
-}