Merge origin/main into mnemonic-ralphised

Resolved conflicts in:
- internal/config/config.go: Combined new bool fields with maintenance settings
- internal/db/gorm/models.go: Merged field reordering with archival fields
- internal/mcp/server.go: Merged field reordering with maintenanceService
- internal/search/manager.go: Updated Metadata field to use 'any' type
- internal/worker/handlers.go: Kept HEAD version
- internal/worker/sdk/processor.go: Combined circuit breaker/dedup with claude path
- internal/worker/service.go: Kept HEAD version
- ui/src/components/Sidebar.vue: Combined new components with useGraphMetrics
- ui/src/utils/api.ts: Combined new APIs with graph/vector metrics

internal/search/manager.go

@@ -623,41 +623,42 @@ func (m *Manager) ClearCache() {
 
 // SearchParams contains parameters for unified search.
 type SearchParams struct {
-	Query             string
-	Type              string // "observations", "sessions", "prompts", or empty for all
+	Format            string
+	Type              string
 	Project           string
-	ObsType           string // Observation type filter
+	ObsType           string
 	Concepts          string
 	Files             string
+	Query             string
+	Scope             string
+	OrderBy           string
 	DateStart         int64
-	DateEnd           int64
-	OrderBy           string // "relevance", "date_desc", "date_asc"
-	Limit             int
 	Offset            int
-	Format            string // "index" or "full"
-	Scope             string // "project", "global", or empty for project+global
-	IncludeGlobal     bool   // If true, include global observations along with project-scoped
-	ExcludeSuperseded bool   // If true, exclude observations that have been superseded
+	Limit             int
+	DateEnd           int64
+	IncludeGlobal     bool
+	ExcludeSuperseded bool
 }
 
 // SearchResult represents a unified search result.
+// Field order optimized for memory alignment (fieldalignment).
 type SearchResult struct {
-	Type      string                 `json:"type"` // "observation", "session", "prompt"
-	ID        int64                  `json:"id"`
-	Title     string                 `json:"title,omitempty"`
-	Content   string                 `json:"content,omitempty"`
-	Project   string                 `json:"project"`
-	Scope     string                 `json:"scope,omitempty"` // "project" or "global"
-	CreatedAt int64                  `json:"created_at_epoch"`
-	Score     float64                `json:"score,omitempty"`
 	Metadata  map[string]any `json:"metadata,omitempty"`
+	Type      string         `json:"type"`
+	Title     string         `json:"title,omitempty"`
+	Content   string         `json:"content,omitempty"`
+	Project   string         `json:"project"`
+	Scope     string         `json:"scope,omitempty"`
+	ID        int64          `json:"id"`
+	CreatedAt int64          `json:"created_at_epoch"`
+	Score     float64        `json:"score,omitempty"`
 }
 
 // UnifiedSearchResult contains the combined search results.
 type UnifiedSearchResult struct {
+	Query      string         `json:"query,omitempty"`
 	Results    []SearchResult `json:"results"`
 	TotalCount int            `json:"total_count"`
-	Query      string         `json:"query,omitempty"`
 }
 
 // UnifiedSearch performs a unified search across all document types.