refactor(playwright): split into playwright-js + playwright-py variants

Rename `playwright-skill/` → `playwright-js/` and add `playwright-py/`
as a verbatim fork of Anthropic's official `webapp-testing` skill
(Apache-2.0). Cross-pollinate: each skill gains patterns and helpers
inspired by the other's strengths, with upstream semantics preserved.

## playwright-js (JS/TS stack)

Renamed from playwright-skill; upstream lackeyjb MIT content untouched.
New sections added (clearly marked, preserving upstream semantics):

- Static HTML vs Dynamic Webapp decision tree (core Anthropic methodology)
- Reconnaissance-Then-Action pattern (navigate → networkidle → inspect → act)
- Console Log Capture snippet (page.on console/pageerror/requestfailed)

Description updated to clarify JS/TS stack fit (React/Next/Vue/Svelte/Node)
and reference `/playwright-py` as the Python sibling.

## playwright-py (Python stack)

Verbatim fork of anthropics/skills/skills/webapp-testing; upstream SKILL.md
and bundled `scripts/with_server.py` + examples kept intact. New scripts
and examples added (all lackeyjb-style conveniences in Python):

Scripts:
  scripts/detect_dev_servers.py   Probe common localhost ports for HTTP
                                  servers; outputs JSON of found services.
  scripts/safe_actions.py         safe_click, safe_type (retry-wrapped),
                                  handle_cookie_banner (common selectors),
                                  build_context_with_headers (env-var-
                                  driven: PW_HEADER_NAME / PW_HEADER_VALUE /
                                  PW_EXTRA_HEADERS='{…json…}').

Examples:
  examples/login_flow.py          Login form + wait_for_url.
  examples/broken_links.py        Scan visible external hrefs via HEAD.
  examples/responsive_sweep.py    Multi-viewport screenshots to /tmp.

SKILL.md gains 5 "Added:" sections documenting the new scripts, retry
helpers, env-header injection, and /tmp script discipline. Attribution
notes explicitly mark upstream vs local additions.

## Makefile

SKILLS: playwright-skill → playwright-js + playwright-py
deps target: extended Playwright step to install Python package +
  Chromium via `python3 -m pip install --user playwright && python3 -m
  playwright install chromium` when playwright-py/ is present. Idempotent
  (detected via `python3 -c "import playwright"`).

## Usage

Both skills symlinked globally via `make install`. Invoke whichever
matches the project stack — cross-references in descriptions route you
to the right one. Run `make deps` once to install both runtimes.

1 files changed, 58 insertions, 0 deletions

diff --git a/playwright-py/examples/broken_links.py b/playwright-py/examples/broken_links.py
new file mode 100644
index 0000000..c78520f
--- /dev/null
+++ b/playwright-py/examples/broken_links.py
@@ -0,0 +1,58 @@
+"""Worked example: scan visible external links on a page for broken URLs.
+
+Env vars used:
+  TARGET_URL (default: http://localhost:5173)
+
+Run:
+  python examples/broken_links.py
+"""
+
+import os
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from playwright.sync_api import sync_playwright
+from scripts.safe_actions import build_context_with_headers
+
+TARGET_URL = os.environ.get("TARGET_URL", "http://localhost:5173")
+
+
+def main() -> int:
+    with sync_playwright() as p:
+        browser = p.chromium.launch(headless=True)
+        context = build_context_with_headers(browser)
+        page = context.new_page()
+
+        page.goto(TARGET_URL)
+        page.wait_for_load_state("networkidle")
+
+        # Collect unique external hrefs
+        links = page.locator('a[href^="http"]').all()
+        urls = sorted(
+            {link.get_attribute("href") for link in links if link.get_attribute("href")}
+        )
+
+        ok, bad, err = 0, 0, 0
+        for url in urls:
+            try:
+                resp = page.request.head(url, timeout=5000)
+                status = resp.status
+                if status < 400:
+                    ok += 1
+                    print(f"✓ {status} {url}")
+                else:
+                    bad += 1
+                    print(f"✗ {status} {url}")
+            except Exception as ex:
+                err += 1
+                print(f"✗ ERR {url}  ({type(ex).__name__}: {ex})")
+
+        print(f"\n{ok} ok, {bad} broken, {err} errored out of {len(urls)} total")
+        browser.close()
+        return 0 if (bad == 0 and err == 0) else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())