docs: seed PRD + SPEC for the Go-direction rewrite

Two documents only — no Go code yet. PRD restates the problem and
preserves the Rust PRD's invariants verbatim, then maps the locked
stack to Go libraries and surfaces four hard problems (DuckDB-via-cgo
for the query engine, Lance dropped, Dioxus → HTMX, arrow-go maturity).
SPEC walks each Rust crate + TS surface and tags the port with library
choice / effort estimate / risk + a 5-phase migration plan from
skeleton (Phase G0) to demo parity (Phase G5).

Six open questions remain that gate Phase G0:
- DuckDB cgo OK?
- HTMX vs React for the UI?
- Repo location?
- Distillation v1.0.0 port verbatim or rebuild?
- Pathway memory data — port 88 traces or start clean?
- Auditor lineage — port audit_baselines.jsonl or restart?

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,49 @@
+# golangLAKEHOUSE
+
+Go reimplementation of the Lakehouse — a versioned knowledge substrate
+for staffing analytics + local AI workloads.
+
+## Status
+
+**Pre-Phase G0.** Documents seeded; Go module declared; implementation
+has not started. See `docs/PRD.md` for direction and `docs/SPEC.md`
+for the component-by-component port plan.
+
+### Phase G0 prerequisites (must be done before any code lands)
+
+1. **Install Go 1.23+ on the dev box.** Not currently present at
+   `/usr/local/go` or elsewhere on the build machine. Standard install:
+   ```
+   curl -L https://go.dev/dl/go1.23.linux-amd64.tar.gz | sudo tar -C /usr/local -xz
+   echo 'export PATH=$PATH:/usr/local/go/bin' >> ~/.bashrc
+   ```
+2. **Ensure cgo toolchain is present** (gcc + libc-dev) — required by
+   the DuckDB binding per ADR-001 §1.1. `apt install build-essential`
+   on Debian-based systems.
+3. **Initialize the dependency tree** with `go mod tidy` once
+   `cmd/gateway/main.go` declares its first imports.
+
+## Layout
+
+```
+docs/                         Direction + spec + ADRs
+cmd/                          (forthcoming) main packages — one per service
+internal/                     (forthcoming) shared packages
+web/                          (forthcoming) HTMX templates + static
+scripts/                      (forthcoming) cold-start, smoke, distill
+tests/                        (forthcoming) golden files, integration tests
+```
+
+## Reading order
+
+1. `docs/PRD.md` — what we're building and why
+2. `docs/SPEC.md` — how, per-component
+3. `docs/DECISIONS.md` — ADRs, starting with ADR-001 (foundational)
+4. `docs/RUST_PATHWAY_MEMORY_NOTE.md` — historical reference for the
+   Rust era's pathway memory state (not migrated)
+
+## Predecessor
+
+The Rust Lakehouse this rewrite supersedes lives at
+`git.agentview.dev/profit/lakehouse`. It remains the live system until
+this Go implementation reaches feature parity (per `docs/SPEC.md` §7).