refactor: P0-P3 fixes, C1 cleanup, architecture diagrams, go.work upgrade

- P0-1: ProviderError type + ReportStatus for precise 401/403 detection
- P0-2: Remove -config flag from deploy/homeagent.service
- P2-1: 5s debounce on context.go Save()
- P2-2→C1: Delete output_set_channel entirely
- P2-3: Extract mediaDataURL/mediaChat helpers
- P2-4: Dedup defaultSources var
- P3: Delete dead packages (embed/tokenizer/container/snapshot)
- P3: Delete dead functions (messagesToMap, RunStageAll)
- CL: Update .gitignore, docs, Makefile, gojieba removal
- Config: Delete config/config.yaml, update docs
- Arch: Remove EmitOutputTo from emitResponse
- CL-1: go.work 1.19→1.21
- Docs: Add Mermaid architecture diagrams to README
- Docs: Add kernel-rebuild requires plugin-rebuild note to PLUGIN_DEV.md

third_party/homeagent-sdk/sdk/memory.go

@@ -1,60 +0,0 @@
-package sdk
-
-// MemoryAPI provides access to the graph memory (entity-relation store).
-type MemoryAPI interface {
-	Recall(query []string, depth int) ([]Entity, []Relation, error)
-	Commit(triples []Triple) error
-	Introspect() (map[string]interface{}, error)
-	MergeEntities(source, target string) (int, error)
-	Purge(criteria map[string]string, mode string) (int, error)
-}
-
-// Entity represents a named entity in the knowledge graph.
-type Entity struct {
-	Name         string `json:"name"`
-	Type         string `json:"type"`
-	MentionCount int    `json:"mention_count"`
-}
-
-// Relation represents a relationship between two entities.
-type Relation struct {
-	SourceName   string `json:"source_name"`
-	TargetName   string `json:"target_name"`
-	RelationType string `json:"relation_type"`
-}
-
-// Triple represents a subject-relation-object triple for the knowledge graph.
-type Triple struct {
-	Subject  string `json:"subject"`
-	Relation string `json:"relation"`
-	Object   string `json:"object"`
-}
-
-// TextMemoryAPI provides access to chronological text event storage.
-type TextMemoryAPI interface {
-	Append(evt TextEvent) error
-}
-
-// TextEvent represents a single text memory event.
-type TextEvent struct {
-	Role      string `json:"role"`
-	Content   string `json:"content"`
-	Timestamp int64  `json:"timestamp"`
-	Channel   string `json:"channel,omitempty"`
-}
-
-// DocMemoryAPI provides access to the document vector store.
-type DocMemoryAPI interface {
-	Query(text string, topK int) []*Doc
-	Insert(doc *Doc) error
-	Remove(id string)
-	Stats() map[string]interface{}
-}
-
-// Doc represents a document in the document store.
-type Doc struct {
-	ID      string  `json:"id"`
-	Title   string  `json:"title"`
-	Content string  `json:"content"`
-	Score   float64 `json:"score,omitempty"`
-}