Add Phase 1 foundation: Go module, core types, DB infrastructure, config

Establish the project foundation with three packages:
- core: shared types (Header, Metadata, Value, ObjectType, UUID generation)
- db: SQLite migration framework, connection management (WAL, FK, busy
  timeout), transaction helpers (StartTX/EndTX), time conversion
- config: runtime configuration (DB path, blob store, Minio, gRPC addr)

Includes initial schema migration (001_initial.sql) with 13 tables covering
shared infrastructure, bibliographic data, and artifact repository. Full test
coverage for all packages, strict linting (.golangci.yaml), and Makefile.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PROGRESS.md

@@ -0,0 +1,33 @@
+# Progress
+
+Tracks implementation progress against the phases in `PROJECT_PLAN.md`.
+
+## Phase 1: Foundation — COMPLETE
+
+**Deliverables:**
+- [x] Go module (`go.mod`) at `git.wntrmute.dev/kyle/exo`
+- [x] `core` package: `Header`, `Metadata`, `Value`, `ObjectType`, `NewUUID`, `MapFromList`/`ListFromMap`
+- [x] SQLite migration framework with embedded SQL files (`db/migrations/`)
+- [x] Initial schema migration (`001_initial.sql`): 13 tables covering shared infrastructure, bibliographic, and artifact repository
+- [x] Database access layer: `Open` (with WAL, foreign keys, busy timeout), `StartTX`/`EndTX`, `ToDBTime`/`FromDBTime`
+- [x] `config` package: `Config` struct with paths for database, blob store, Minio endpoint, gRPC listen address
+- [x] `.golangci.yaml` — strict linting (errcheck, govet, gosec, staticcheck, revive, errorlint)
+- [x] `Makefile` — vet, lint, test, build targets
+- [x] Full test coverage for all packages (core, db, config)
+
+**Files created:**
+- `go.mod`, `go.sum`
+- `core/core.go`, `core/core_test.go`
+- `db/db.go`, `db/db_test.go`, `db/migrations/001_initial.sql`
+- `config/config.go`, `config/config_test.go`
+- `.golangci.yaml`, `Makefile`
+
+## Phase 2: Artifact Repository — IN PROGRESS
+
+## Phase 3: CLI Tools — NOT STARTED
+
+## Phase 4: Knowledge Graph — NOT STARTED
+
+## Phase 5: Desktop Application — NOT STARTED (Kotlin, out of scope for Go backend)
+
+## Phase 6: Remote Access & Backup — NOT STARTED