…uilder"

This reverts commit 42bc034.

…in QualityDimensionResultTest

- DifferentiationResult value object (similarityScore, differentiationScore, angles[], gaps[], recommendations[])
- DifferentiationAnalysisService: analyze() + enrichBrief()
  - Calculates similarity/differentiation scores via SimilarityCalculator
  - LLM-powered angle/gap/recommendation generation via LLMManager
  - Stores results in differentiation_analyses table
  - Brief enrichment injects competitor context into brief requirements
- AnalyzeContentDifferentiationJob on 'competitor' queue
- Unit tests: DifferentiationResultTest, DifferentiationAnalysisServiceTest, AnalyzeContentDifferentiationJobTest

- Add CompetitorAnalysisStage implementing PipelineStageContract
  - Stage type: 'competitor_analysis'
  - Runs after brief creation, before content generation
  - Calls DifferentiationAnalysisService::enrichBrief() to add
    competitor context (angles, gaps, recommendations) to brief metadata
  - Configurable per-stage: enabled, similarity_threshold, max_competitors
  - Skips gracefully when disabled or no similar competitors found
  - Updates PipelineRun context with competitor_analysis data

- Update config/numen.php with 'competitor_analysis' section:
  - enabled (COMPETITOR_ANALYSIS_ENABLED)
  - similarity_threshold (COMPETITOR_SIMILARITY_THRESHOLD)
  - max_competitors_to_analyze (COMPETITOR_MAX_ANALYZE)
  - auto_enrich_briefs (COMPETITOR_AUTO_ENRICH_BRIEFS)

- Register CompetitorAnalysisStage in AppServiceProvider via
  HookRegistry::registerPipelineStageClass() — works with existing
  PipelineExecutor + PluginStageJob infrastructure

- Integration tests (tests/Feature/Competitor/CompetitorAnalysisStageTest.php):
  - Stage type/label/schema contract
  - Skips when stage config disabled
  - Skips when global config disabled
  - Skips gracefully with no competitors in DB
  - Enriches brief when similar competitors exist
  - Updates run context with competitor data
  - Enriches brief requirements array
  - Stage registered in HookRegistry

…ob, email/Slack/webhook channels (chunk 6/10)

…r, competitor nodes + similarity edges (chunk 7/10)

…nk 8/10)

…rceManager, DifferentiationScoreWidget, trend chart (chunk 9/10)

…NGELOG, blog post (chunk 10/10)

- Add space_id (string 26, indexed) to migration
- Add space_id to CompetitorContentItem $fillable and space() BelongsTo relation
- Update CompetitorContentItemFactory to include space_id via Space::factory()
- Fix ContentFingerprintFactory to use keyword => score format (not plain array)
- Fix ContentFingerprintService::fingerprint() to handle ContentBrief, using
  target_keywords as primary topics for accurate similarity matching
- Fix SimilarityCalculator::buildKeywordVector() to handle both numeric-indexed
  and associative keyword arrays
- Add RefreshDatabase to CrawlerServiceTest (needed for DB-backed dedup test)
- Add tests/bootstrap.php to fix APP_BASE_PATH for git worktree + symlinked vendor
- Set APP_BASE_PATH in phpunit.xml so Application::inferBasePath() resolves correctly
  (vendor/ is symlinked to main repo; without APP_BASE_PATH, migrations load from
  wrong directory)

- Add space_id column to migration (string 26, ULID-compatible)
- Add space_id to CompetitorContentItem fillable + space() BelongsTo
- Fix ContentFingerprintService: handle ContentBrief model, use
  firstOrCreate to preserve seeded fingerprints in tests
- Fix SimilarityCalculator: handle indexed keyword arrays (list format)
  alongside associative (term => score) format
- Add APP_BASE_PATH to phpunit.xml so RefreshDatabase finds correct
  migrations in the git worktree

…r differentiation

- IDOR: Add space ownership checks to CompetitorController (crawl, alerts, destroyAlert),
  CompetitorSourceController (index, store, show, update, destroy),
  DifferentiationController (index, show, summary), and GraphQL mutations
  (TriggerCompetitorCrawl, DeleteCompetitorSource, DeleteCompetitorAlert, UpdateCompetitorSource)
- SSRF: Add ExternalUrl rule to url/feed_url in StoreCompetitorSourceRequest and
  UpdateCompetitorSourceRequest; add ExternalUrl rule to slack_webhook/webhook_url
  in StoreCompetitorAlertRequest
- Space scoping: Verify space_id access on all collection endpoints
- Rate limiting: Add throttle:5,1 middleware to crawl trigger route
- Quota: Enforce max 50 competitor sources per space in store()
- Pre-existing: Remove duplicate match arm and duplicate extractFromBrief() method
  in ContentFingerprintService (caused phpstan errors)