Unify product version at 1.4.0, add ruff gate, drop stale GitHub workflow

- One version (1.4.0) across extension/manifest.json, automation/pyproject.toml,
  automation-js/package.json (+lockfile); README documents the bump-together policy
- Delete .github/workflows/ci.yml (behind the Gitea copy; CI runs on Gitea Actions)
- CURSOR_PROMPT.md: replace personal paths with <path-to-context-extractor>
- Add ruff (E4,E7,E9,F,I, line-length 120) to automation/ dev extras, Makefile lint,
  and the Gitea CI Lint + tests job as a hard gate

automation-js/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "context-extractor",
-  "version": "1.0.0",
+  "version": "1.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "context-extractor",
-      "version": "1.0.0",
+      "version": "1.4.0",
       "license": "MIT",
       "devDependencies": {
         "@types/node": "^22.15.0",

automation-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "context-extractor",
-  "version": "1.0.0",
+  "version": "1.4.0",
   "description": "Capture console/network/errors and extract AI-ready markdown from a Playwright (Node) page — JS/TS twin of the automation/ Python package, sharing the same extension/core/*.js.",
   "license": "MIT",
   "type": "module",