vrcx 0.2.0-dev: BMC + SDS parallel collector

Initial commit of vrcx (Vegman Remote Collect, extended) — the BMC-only
bmccollect renamed and extended with a parallel SDS-host log branch.

- dev/prod/old repo layout
- per-host bmc/ + os/ subdirs, archives/dump_<ip>.tar.gz, outer session tarball
- SdsSession (paramiko, sudo via -S), OS_COMMAND_TABLE (lsiget, storcli, smartctl, journal, dmidecode, etc.)
- SDS IP discovery via Redfish EthernetInterfaces -> /24 ping-sweep -> arp -a
- UI shows BMC|OS dual progress per host
- CI/pyinstaller paths updated for dev/

CONTRIBUTING.md

@@ -0,0 +1,68 @@
+# Contributing
+
+> Project layout, build, and release flow. **If you only want to use the tool — read [README](README.md) instead.**
+
+## Repo layout
+
+```
+bmccollect/
+├── .github/
+│   ├── workflows/release.yml          ← CI: tag-driven build + GitHub Release
+│   └── ISSUE_TEMPLATE/                ← bug / feature / security routing
+├── src/bmccollect/                    ← package source (≤200 lines per module)
+│   ├── __init__.py                    ← single source of truth for __version__
+│   ├── __main__.py                    ← entry: python -m bmccollect
+│   ├── app.py                         ← orchestration: prompts, threads, packaging
+│   ├── platform_win.py                ← VT enable
+│   ├── update_check.py                ← GitHub /releases/latest poll
+│   ├── commands.py                    ← table of "filename → how to obtain it"
+│   ├── bmc.py                         ← BmcSession (SSH + Redfish helper)
+│   ├── collector.py                   ← per-host collect loop
+│   ├── tarball.py                     ← layout, per-host & session tar.gz
+│   └── ui.py                          ← rich-based TUI
+├── bmccollect-launcher.py             ← PyInstaller entry (root, absolute import)
+├── pyproject.toml                     ← deps, packaging, dynamic version
+├── CHANGELOG.md / CONTRIBUTING.md / LICENSE / README.md / SECURITY.md
+└── .gitignore
+```
+
+## Run from source
+
+```
+python -m pip install rich paramiko
+PYTHONPATH=src python -m bmccollect
+```
+
+## Editable install
+
+```
+python -m pip install -e .
+bmccollect
+```
+
+## Build the portable .exe
+
+```
+python -m pip install pyinstaller rich paramiko
+python -m PyInstaller --onefile --console --name bmccollect --paths src bmccollect-launcher.py
+```
+
+## Cut a release
+
+1. Update `src/bmccollect/__init__.py` — bump `__version__` to `X.Y.Z`.
+2. Update `CHANGELOG.md` — move items from `[Unreleased]` into a new `[X.Y.Z]` section with today's date.
+3. Commit: `git commit -am "vX.Y.Z: …"`.
+4. Tag: `git tag vX.Y.Z`.
+5. Push: `git push && git push --tags`.
+
+CI builds the exe and creates the GitHub Release with the zip attached.
+
+## Where features go
+
+| Adding... | Touch this module |
+|---|---|
+| A new artefact (file in the dump) | `commands.py` → one new `CommandSpec` row |
+| Support for a new BMC API (e.g. IPMI) | `bmc.py` → add a method on `BmcSession`; reference it from `commands.py` with a new `kind` |
+| New per-host UI column / progress detail | `ui.py` → `Ui._render_table` + `set_progress` / `set_summary` |
+| Different output naming or layout | `tarball.py` |
+| Tweaking the startup banner / prompts | `app.py` → `main` / `_prompt_inputs` |