Initial bootstrap: fnode CLI + hbrtl_ext pipeline

* cmd/fnode — build/run CLI that drives Five's compiler packages
  (pp, parser, analyzer, gengo) and stitches generated prg_*.go
  together with fivenode_go's own hbrtl_ext/* packages in a temp
  module. Result is one self-contained Go binary; no FFI, no Node.

* hbrtl_ext/hello — bootstrap RTL extension proving the
  blank-import-init() registration path works end-to-end. Exposes
  FNODE_HELLO() to PRG.

* app/hello.prg — minimum end-to-end test: calls Date() (Five RTL)
  and FNODE_HELLO() (fivenode_go RTL) from the same binary.

Verified: ./fnode build app/hello.prg -o hello_app → 17 MB single
binary that prints both lines. The same pattern will host the
HTTP server, bridge capi helpers, and PostgreSQL client coming
in 1a.2b–1a.4.

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

README.md

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+# fivenode_go
+
+FiveNode for [Five](https://gitea.fivego.org/fivedev/five) — a Harbour-compatible
+web framework that compiles to a **single Go binary**. No Node.js, no FFI,
+no Apache. PRG sources go in, one executable comes out.
+
+Successor to the koffi/N-API based [fivenode](https://gitea.fivego.org/fivenode/fivenode)
+framework, rebuilt on the Five Pure-Go runtime.
+
+## Status
+
+Early bootstrap — Phase 1a in progress.
+
+## Architecture
+
+```
+Browser ──── HTTP/HTTPS ──── fivenode_go single binary
+                              ├─ Five hbrt VM (PRG interpreter / compiled)
+                              ├─ Five hbrtl (483 standard RTL functions)
+                              ├─ hbrtl_ext/httpserver  — HTTP server RTL
+                              ├─ hbrtl_ext/capi        — bridge_*.prg helpers
+                              ├─ hbrtl_ext/pgrtl       — PostgreSQL client RTL
+                              ├─ app/                  — bridge_*.prg + app PRG
+                              └─ go:embed              — static assets
+```
+
+`fnode build api/*.prg --extra-rtl=hbrtl_ext/... -o myapp` produces a
+self-contained binary. No external dependencies beyond what the app code
+itself opens (e.g. a Postgres connection).
+
+## Build
+
+```bash
+go build -o fnode ./cmd/fnode
+./fnode build app/hello.prg -o hello
+./hello
+```
+
+## License
+
+Copyright (c) 2026 Charles KWON OhJun. All rights reserved.