docs: complete archive migration

- Remove all old doc/*.md from git tracking
- All docs now in doc/archive/ (gitignored)
- README.md and CONTRIBUTING.md at root for rewrite

Author: cfxdevkit

CONTRIBUTING.md

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+# Contributing to LocalPibox
+
+LocalPibox is a personal, local-first AI devstack on
+[Pi.dev](https://pi.dev). The stack is designed to be **forked and
+personalized** — you are welcome to contribute directly, fork it for your own
+stack, or share what works on your hardware.
+
+There are **three ways to get involved**:
+
+---
+
+## 1. Contribute directly
+
+Improve patches, add features, or fix bugs in any of the repos. Each repository
+has its own scope:
+
+| Repo | What to work on |
+|---|---|
+| [devstack](https://github.com/localpibox/devstack) | Container image (`Dockerfile`), `lpb` launcher (`scripts/`), entrypoints (`support/`), CI |
+| [config](https://github.com/localpibox/config) | Pi settings, MCP servers, custom skills, subagents presets |
+| [pi](https://github.com/localpibox/pi) | Qwen `reasoning_effort` + context-overflow patches (fork) |
+| [lemonade-pi-plugin](https://github.com/localpibox/lemonade-pi-plugin) | Qwen thinking + vision support (fork) |
+| [pi-subagents](https://github.com/localpibox/pi-subagents) | Centralized subagent model registry (fork) |
+| [lpb-memory](https://github.com/localpibox/lpb-memory) | Persistent memory / session search extension |
+| [localpibox](https://github.com/localpibox/localpibox) | Project overview & stack reference |
+| [localpibox.github.io](https://github.com/localpibox/localpibox.github.io) | GitHub Pages project site |
+
+### Process
+
+1. Fork the repo and create a feature branch off its stable branch
+   (`main` for own repos, `lpb` for forks).
+2. Make focused changes. **Prefer minimal, targeted patches** over broad
+   rewrites.
+3. For forks, keep work as a **single squashed commit** on `lpb` so the delta
+   vs upstream stays one clean patch.
+4. Open a PR. Describe what changed, why, and how you tested it.
+
+### Policy notes
+
+- **Never hardcode model names in agent defaults** — use `model: parent` so
+  agents inherit the session model. See the config repo's `agents/` templates.
+- **Anthropic models are not used** in this stack; Qwen (via Lemonade) is the
+  default.
+- Forks carry candidate **upstream contributions**: ship a patch upstream when
+  it's generally useful and not too opinionated for this stack.
+
+## 2. Fork for your stack
+
+1. Fork the repos you care about.
+2. Clone devstack and edit `lpb.stack.env` to point at your forks (see
+   [Forking & Repointing](https://github.com/localpibox/devstack#forking--repointing)).
+3. Build & push your image, then run `lpb`.
+
+You own your variant — change anything: image names, container name, branch
+refs, config preset.
+
+## 3. Feed back experiences
+
+Share what works reliably on **your hardware with your models**. Configuration
+like context-window ratios, thinking levels, and model detection depends
+heavily on the actual host (CPU/APU, RAM, model size). Your findings help
+everyone converge on robust local setups.
+
+Open an issue or PR with:
+- Your hardware (e.g. "Ryzen AI Max+ 395, 128 GB").
+- The model + provider + Pi version.
+- What worked, what overflowed, and any tuning you discovered.
+
+---
+
+## Reporting issues
+
+Open an issue in the relevant repo (usually `devstack`). Include:
+
+- What you were doing.
+- Exact command(s) and output.
+- Host OS, container engine (podman/docker), and stack version (from
+  `VERSION` / `lpb.conf.env`).
+
+## Code of conduct
+
+Keep it friendly and constructive — this is a personal stack shared in public.
+Respect other people's hardware, models, and workflows.