Add structured project tools with rich relationships

Replace chunk-based project tools with dedicated structured project
tools that store projects as single Qdrant points with rich JSON
payloads. Adds list_projects, get_project, upsert_project,
update_project, and delete_project tools with Zod discriminated
union validation for per-category relationship operations.

src/lib/projects.ts

@@ -0,0 +1,102 @@
+import { createHash } from "crypto";
+import { embed } from "./embeddings.js";
+import { getClient, COLLECTION } from "./qdrant.js";
+
+// --- Relationship types ---
+
+export interface HostRelationship {
+  host: string;
+  role: string;
+  description?: string;
+}
+
+export interface SoftwareRelationship {
+  name: string;
+  role: string;
+  version?: string;
+  description?: string;
+}
+
+export interface GitRepoRelationship {
+  repo: string;
+  path?: string;
+  role: string;
+  description?: string;
+}
+
+export interface LocalDirRelationship {
+  path: string;
+  role: string;
+  description?: string;
+}
+
+export interface ProjectRelationships {
+  hosts: HostRelationship[];
+  software: SoftwareRelationship[];
+  git_repos: GitRepoRelationship[];
+  local_dirs: LocalDirRelationship[];
+}
+
+// --- Project payload (stored as Qdrant point payload) ---
+
+export interface ProjectPayload {
+  slug: string;
+  name: string;
+  status: string;
+  summary: string;
+  tags: string[];
+  current_state: string;
+  blockers: string[];
+  decisions_pending: string[];
+  relationships: ProjectRelationships;
+  key_facts: string[];
+  history: string[];
+  updated: string;
+  type: "project";
+}
+
+// --- Helpers ---
+
+export function projectPointId(slug: string): string {
+  const hash = createHash("sha256").update(`project\0${slug}`).digest("hex");
+  return [
+    hash.slice(0, 8),
+    hash.slice(8, 12),
+    hash.slice(12, 16),
+    hash.slice(16, 20),
+    hash.slice(20, 32),
+  ].join("-");
+}
+
+export function buildEmbeddingText(payload: ProjectPayload): string {
+  const parts = [payload.summary, payload.current_state, ...payload.key_facts, ...payload.tags];
+  return parts.filter(Boolean).join(" ");
+}
+
+export function emptyRelationships(): ProjectRelationships {
+  return { hosts: [], software: [], git_repos: [], local_dirs: [] };
+}
+
+// --- Data access ---
+
+export async function getProjectPoint(slug: string): Promise<ProjectPayload | null> {
+  const client = getClient();
+  const id = projectPointId(slug);
+  try {
+    const points = await client.retrieve(COLLECTION, { ids: [id], with_payload: true, with_vector: false });
+    if (points.length === 0) return null;
+    return points[0].payload as unknown as ProjectPayload;
+  } catch {
+    return null;
+  }
+}
+
+export async function upsertProjectPoint(payload: ProjectPayload): Promise<string> {
+  const client = getClient();
+  const id = projectPointId(payload.slug);
+  const vector = await embed(buildEmbeddingText(payload));
+  await client.upsert(COLLECTION, {
+    points: [{ id, vector, payload: payload as unknown as Record<string, unknown> }],
+  });
+  return id;
+}