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/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "context-extractor"
-version = "1.3.0"
+version = "1.4.0"
 description = "Capture console/network/errors and extract AI-ready markdown from a Playwright or Camoufox page."
 readme = "README.md"
 requires-python = ">=3.9"
@@ -13,7 +13,7 @@ dependencies = [
 
 [project.optional-dependencies]
 camoufox = ["camoufox[geoip]>=0.4"]
-dev = ["pytest>=8.0", "pytest-asyncio>=0.23"]
+dev = ["pytest>=8.0", "pytest-asyncio>=0.23", "ruff>=0.8"]
 
 [project.scripts]
 context-extractor = "context_extractor.cli:main"

automation/ruff.toml

@@ -0,0 +1,4 @@
+line-length = 120
+
+[lint]
+select = ["E4", "E7", "E9", "F", "I"]