feat(learnings): add store and MCP tool layer

internal/types/learning.go

@@ -0,0 +1,68 @@
+package types
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type LearningEvidenceLevel string
+
+const (
+	LearningEvidenceHypothesis LearningEvidenceLevel = "hypothesis"
+	LearningEvidenceObserved   LearningEvidenceLevel = "observed"
+	LearningEvidenceVerified   LearningEvidenceLevel = "verified"
+)
+
+type LearningStatus string
+
+const (
+	LearningStatusPending    LearningStatus = "pending"
+	LearningStatusInProgress LearningStatus = "in_progress"
+	LearningStatusResolved   LearningStatus = "resolved"
+	LearningStatusWontFix    LearningStatus = "wont_fix"
+	LearningStatusPromoted   LearningStatus = "promoted"
+)
+
+type LearningPriority string
+
+const (
+	LearningPriorityLow    LearningPriority = "low"
+	LearningPriorityMedium LearningPriority = "medium"
+	LearningPriorityHigh   LearningPriority = "high"
+)
+
+type Learning struct {
+	ID                    uuid.UUID             `json:"id"`
+	Summary               string                `json:"summary"`
+	Details               string                `json:"details"`
+	Category              string                `json:"category"`
+	Area                  string                `json:"area"`
+	Status                LearningStatus        `json:"status"`
+	Priority              LearningPriority      `json:"priority"`
+	Confidence            LearningEvidenceLevel `json:"confidence"`
+	ActionRequired        bool                  `json:"action_required"`
+	SourceType            string                `json:"source_type,omitempty"`
+	SourceRef             string                `json:"source_ref,omitempty"`
+	ProjectID             *uuid.UUID            `json:"project_id,omitempty"`
+	RelatedThoughtID      *uuid.UUID            `json:"related_thought_id,omitempty"`
+	RelatedSkillID        *uuid.UUID            `json:"related_skill_id,omitempty"`
+	ReviewedBy            *string               `json:"reviewed_by,omitempty"`
+	ReviewedAt            *time.Time            `json:"reviewed_at,omitempty"`
+	DuplicateOfLearningID *uuid.UUID            `json:"duplicate_of_learning_id,omitempty"`
+	SupersedesLearningID  *uuid.UUID            `json:"supersedes_learning_id,omitempty"`
+	Tags                  []string              `json:"tags"`
+	CreatedAt             time.Time             `json:"created_at"`
+	UpdatedAt             time.Time             `json:"updated_at"`
+}
+
+type LearningFilter struct {
+	Limit     int
+	ProjectID *uuid.UUID
+	Category  string
+	Area      string
+	Status    string
+	Priority  string
+	Tag       string
+	Query     string
+}