feat: always-on Insights — correlation analysis over viewing habits

Conservative, live insights (ADR-0010) derived from each user's diary:
rating lift by genre (first-time watches only), genre seasonality vs a
uniform 1/12 month baseline, medium weekend-lift, and watch-time rhythm.

- domain: WatchRow model, InsightsQuery port, pure insights_analyzer with
  all honesty thresholds (sample minimums, strength cutoffs, suppressions
  for import noise), unit-tested
- adapters: thin Sqlite/Postgres fetch twins, reusing WrapUp's genre fetch
- application: get_insights use case, InsightsGroup in Deps
- composition/server: wiring through Repositories/DatabaseOutput
- presentation: GET /api/v1/insights handler, typed serde-tagged DTOs,
  openapi doc
- spa: /insights route (shadcn cards), insights feature hook, profile
  entry link, en locale strings
- server test: end-to-end seed sqlite → HTTP → rating lift + rhythm

Also records ADR-0010, defines "Insight" in the glossary, and includes
pre-existing worktree comment-stripping cleanups.

crates/composition/src/build.rs

@@ -2,8 +2,9 @@ use application::auth::deps::{
     LoginDeps, LogoutDeps, RefreshDeps, RegisterAndLoginDeps, RegisterDeps,
 };
 use application::deps::{
-    AuthGroup, Deps, DiaryGroup, GoalsGroup, ImportGroup, IntegrationsGroup, MoviesGroup,
-    PersonGroup, SearchGroup, SocialGroup, UsersGroup, WatchlistGroup, WorkerDeps, WrapupGroup,
+    AuthGroup, Deps, DiaryGroup, GoalsGroup, ImportGroup, InsightsGroup, IntegrationsGroup,
+    MoviesGroup, PersonGroup, SearchGroup, SocialGroup, UsersGroup, WatchlistGroup, WorkerDeps,
+    WrapupGroup,
 };
 use application::diary::deps::{
     DeleteReviewDeps, EditReviewDeps, ExportDiaryDeps, GetActivityFeedDeps, GetDiaryDeps,
@@ -15,6 +16,7 @@ use application::import::deps::{
     DeleteImportProfileDeps, ExecuteImportDeps, GetMappingStageDeps, GetPreviewStageDeps,
     GetSessionStateDeps, ListImportProfilesDeps, SaveProfileDeps,
 };
+use application::insights::deps::GetInsightsDeps;
 use application::integrations::deps::{
     ConfirmWatchEventsDeps, DismissWatchEventsDeps, GenerateWebhookTokenDeps, GetWatchQueueDeps,
     GetWebhookTokensDeps, IngestWatchEventDeps, RevokeWebhookTokenDeps,
@@ -175,6 +177,11 @@ pub fn build_deps(
                 import_profile: repos.import_profile.clone(),
             },
         },
+        insights: InsightsGroup {
+            get: GetInsightsDeps {
+                insights: repos.insights.clone(),
+            },
+        },
         integrations: IntegrationsGroup {
             ingest_watch_event: IngestWatchEventDeps {
                 webhook_token: repos.webhook_token.clone(),

crates/composition/src/factory.rs

@@ -32,6 +32,7 @@ pub struct DatabaseOutput {
     pub ap_content: Arc<dyn LocalApContentQuery>,
     pub wrapup_stats: Arc<dyn domain::ports::WrapUpStatsQuery>,
     pub wrapup_repo: Arc<dyn domain::ports::WrapUpRepository>,
+    pub insights: Arc<dyn domain::ports::InsightsQuery>,
     pub goal_command: Arc<dyn domain::ports::GoalCommand>,
     pub goal_query: Arc<dyn domain::ports::GoalQuery>,
     pub user_settings: Arc<dyn domain::ports::UserSettingsRepository>,
@@ -91,6 +92,7 @@ pub async fn build_database_adapters(
                 ap_content: w.ap_content,
                 wrapup_stats: w.wrapup_stats,
                 wrapup_repo: w.wrapup_repo,
+                insights: w.insights,
                 goal_command: w.goal_command,
                 goal_query: w.goal_query,
                 user_settings: w.user_settings,
@@ -145,6 +147,7 @@ pub async fn build_database_adapters(
                 ap_content: w.ap_content,
                 wrapup_stats: w.wrapup_stats,
                 wrapup_repo: w.wrapup_repo,
+                insights: w.insights,
                 goal_command: w.goal_command,
                 goal_query: w.goal_query,
                 user_settings: w.user_settings,

crates/composition/src/repositories.rs

@@ -2,12 +2,12 @@ use std::sync::Arc;
 
 use domain::ports::{
     BlockQuery, DiaryQuery, FederatedProfileQuery, FederationAdminQuery, FollowGraphQuery,
-    GoalCommand, GoalQuery, ImportProfileRepository, ImportSessionRepository, MovieCommand,
-    MovieProfileRepository, MovieQuery, PersonCommand, PersonQuery, RefreshSessionRepository,
-    RemoteGoalRepository, RemoteWatchlistRepository, ReviewRepository, SearchCommand, SearchPort,
-    SocialCommand, StatsRepository, UserProfileFieldsRepository, UserRepository,
-    UserSettingsRepository, WatchEventCommand, WatchEventQuery, WatchlistRepository,
-    WebhookTokenRepository, WrapUpRepository, WrapUpStatsQuery,
+    GoalCommand, GoalQuery, ImportProfileRepository, ImportSessionRepository, InsightsQuery,
+    MovieCommand, MovieProfileRepository, MovieQuery, PersonCommand, PersonQuery,
+    RefreshSessionRepository, RemoteGoalRepository, RemoteWatchlistRepository, ReviewRepository,
+    SearchCommand, SearchPort, SocialCommand, StatsRepository, UserProfileFieldsRepository,
+    UserRepository, UserSettingsRepository, WatchEventCommand, WatchEventQuery,
+    WatchlistRepository, WebhookTokenRepository, WrapUpRepository, WrapUpStatsQuery,
 };
 
 #[derive(Clone)]
@@ -37,6 +37,7 @@ pub struct Repositories {
     pub federation_admin: Arc<dyn FederationAdminQuery>,
     pub wrapup_stats: Arc<dyn WrapUpStatsQuery>,
     pub wrapup_repo: Arc<dyn WrapUpRepository>,
+    pub insights: Arc<dyn InsightsQuery>,
     pub goal_command: Arc<dyn GoalCommand>,
     pub goal_query: Arc<dyn GoalQuery>,
     pub user_settings: Arc<dyn UserSettingsRepository>,

crates/composition/src/tests/build.rs

@@ -5,13 +5,13 @@ use domain::testing::{
     FakeAuthService, FakeDocumentParser, FakeMetadataClient, FakePasswordHasher, FakePersonQuery,
     FakePosterFetcher, FakeSearchCommand, FakeSearchPort, FakeStatsRepository,
     InMemoryGoalRepository, InMemoryImportProfileRepository, InMemoryImportSessionRepository,
-    InMemoryMovieProfileRepository, InMemoryMovieRepository, InMemoryProfileFieldsRepo,
-    InMemoryRefreshSessionRepository, InMemoryReviewRepository, InMemorySocialRepository,
-    InMemoryUserRepository, InMemoryUserSettingsRepository, InMemoryWatchEventRepository,
-    InMemoryWatchlistRepository, InMemoryWebhookTokenRepository, InMemoryWrapUpRepository,
-    InMemoryWrapUpStatsQuery, NoopEventPublisher, NoopFederationAdminQuery, NoopObjectStorage,
-    NoopRemoteGoalRepository, NoopRemoteWatchlistRepository, PanicDiaryExporter,
-    PanicPersonCommand,
+    InMemoryInsightsQuery, InMemoryMovieProfileRepository, InMemoryMovieRepository,
+    InMemoryProfileFieldsRepo, InMemoryRefreshSessionRepository, InMemoryReviewRepository,
+    InMemorySocialRepository, InMemoryUserRepository, InMemoryUserSettingsRepository,
+    InMemoryWatchEventRepository, InMemoryWatchlistRepository, InMemoryWebhookTokenRepository,
+    InMemoryWrapUpRepository, InMemoryWrapUpStatsQuery, NoopEventPublisher,
+    NoopFederationAdminQuery, NoopObjectStorage, NoopRemoteGoalRepository,
+    NoopRemoteWatchlistRepository, PanicDiaryExporter, PanicPersonCommand,
 };
 
 use crate::{DatabaseOutput, Repositories, build::build_deps, build::build_worker_deps};
@@ -254,6 +254,7 @@ fn test_repositories() -> Repositories {
         federation_admin: Arc::new(NoopFederationAdminQuery),
         wrapup_stats: InMemoryWrapUpStatsQuery::new(),
         wrapup_repo: InMemoryWrapUpRepository::new(),
+        insights: InMemoryInsightsQuery::new(),
         goal_command: Arc::clone(&goals) as _,
         goal_query: goals as _,
         user_settings: InMemoryUserSettingsRepository::new(),
@@ -312,6 +313,7 @@ fn test_database_output() -> DatabaseOutput {
         ap_content: Arc::new(NoopLocalApContentQuery),
         wrapup_stats: InMemoryWrapUpStatsQuery::new(),
         wrapup_repo: InMemoryWrapUpRepository::new(),
+        insights: InMemoryInsightsQuery::new(),
         goal_command: Arc::clone(&goals) as _,
         goal_query: goals as _,
         user_settings: Arc::clone(&user_settings) as _,