asw-v01: archive deferred content (packs, site, lab, legacy examples)

- 2.1: packs/ -> archive/packs/
- 2.2: site/ -> archive/site/
- 2.3: src/lab/ -> archive/lab/
- 2.4: examples/ -> archive/examples-legacy/ (SSI-based)

archive/packs/flask/README.md

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+# ASW Flask/FastAPI Error Pack
+
+Drop-in styled error responses for Flask and FastAPI applications.
+
+## Usage
+
+```python
+# Copy asw_errors.py to your project directory, then:
+
+from flask import Flask
+from asw_errors import register_asw_errors
+
+app = Flask(__name__)
+register_asw_errors(app)
+```
+
+```python
+from fastapi import FastAPI
+from asw_errors import register_asw_errors
+
+app = FastAPI()
+register_asw_errors(app)
+```
+
+## What you get
+
+ASW-styled HTML error pages for all HTTP error codes:
+
+| Code | Status |
+|------|--------|
+| 400  | Bad Request |
+| 401  | Unauthorized |
+| 403  | Forbidden |
+| 404  | Not Found |
+| 405  | Method Not Allowed |
+| 408  | Request Timeout |
+| 409  | Conflict |
+| 410  | Gone |
+| 415  | Unsupported Media Type |
+| 422  | Unprocessable Entity |
+| 429  | Too Many Requests |
+| 500  | Internal Server Error |
+| 502  | Bad Gateway |
+| 503  | Service Unavailable |
+| 504  | Gateway Timeout |
+
+For FastAPI, `RequestValidationError` (422) is also caught separately.
+
+## Linking asw.css
+
+By default, styles are inlined — no external dependencies needed. If your app already serves `asw.css`, link it instead:
+
+```python
+register_asw_errors(app, css_url="/static/asw.css")
+```
+
+The pages will then use your full theme including custom fonts.
+
+## Custom app name
+
+The nav bar shows your app's name. Override it:
+
+```python
+register_asw_errors(app, app_name="My Service")
+```
+
+Flask auto-detects from `app.name`; FastAPI from `app.title`. Both fall back to sensible defaults.
+
+## Standalone HTML generation
+
+The `error_html()` function is also exported if you need to generate pages directly:
+
+```python
+from asw_errors import error_html
+
+html = error_html(404, path="/missing/route")
+html = error_html(500, css_url="/static/asw.css", app_name="My API")
+```
+
+## No dependencies at module level
+
+Flask and FastAPI are imported lazily inside `register_asw_errors()` — so this file can live in a project that uses either framework without both installed.