feat: Complete uteke_client.rs — add missing doc, graph, tags, pin, timeline methods

[ajianaz]

Problem

uteke_client.rs currently implements 18/33 available uteke-serve HTTP methods. 15 methods are missing across documents, graph mutations, tags, pin/unpin, timeline, and edges.

Gap Analysis

Documents (7 methods — HIGH priority)

Method	Endpoint	Description
doc_list	POST /doc/list	List documents
doc_get	POST /doc/get	Get document by slug/ID
doc_create	POST /doc/create	Create or update document
doc_search	POST /doc/search	Semantic + FTS5 hybrid search
doc_delete	POST /doc/delete	Delete document (cascades)
doc_children	POST /doc/children	List child documents
doc_move	POST /doc/move	Move document to new parent

Graph Mutations (2 methods — HIGH priority)

Method	Endpoint	Description
add_edge	POST /graph/edge	Add graph edge (enables dropping uteke-core)
remove_edge	DELETE /graph/edge	Remove graph edge

Graph Read-only (3 methods — MEDIUM)

Method	Endpoint	Description
neighbors	GET /graph/neighbors	BFS from node
path	GET /graph/path	Shortest path
stats	GET /graph/stats	Graph statistics

Other (3 methods — LOW)

Method	Endpoint	Description
Tags	GET /tags	List tags with counts
Pin/Unpin	POST /pin, POST /unpin	Pin memory
Timeline	GET /timeline	Memory audit log

Requirements

• Rust structs: UtekeDoc, UtekeDocChunk (mirrors uteke-serve response)
• All doc endpoints are POST with JSON body (consistent with existing room endpoints)
• Reference: uteke-serve-doc-api.md in hub-dev skill references

Acceptance Criteria

• All 15 methods compile and pass cargo check
• cargo test passes
• ipc.ts + types.ts updated with doc-related types
• Existing room endpoints unaffected

Related

• Kanban task: t_3e955067, t_9162ad2e, t_c4227180
• Uteke doc: corin-kanban-integration-api (namespace: codecora)

[ajianaz]

Delivered by #121 — tags/pin/timeline/edges client methods are now in uteke_client.rs.