Add automate-this plugin: screen recording to automation scripts (#930)

* Add automate-this plugin: screen recording to automation scripts

New plugin that analyzes screen recordings of manual processes and
proposes working automation scripts at multiple complexity tiers.

Features:
- Frame extraction via ffmpeg for visual process reconstruction
- Optional audio transcription via Whisper for narrated recordings
- Environment fingerprinting to constrain proposals to installed tools
- Application-specific automation strategies (browser, spreadsheet,
  email, terminal, file management, macOS-native)
- Three-tier proposal system (quick win, full script, scheduled automation)
- Dry-run support for safe testing of all proposals

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update skills/automate-this/SKILL.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Address code review feedback on automate-this plugin

- Fix privacy section: clarify that frames/audio are processed locally
  but sent to the Copilot model for analysis (not purely local)
- Replace 'which' with 'command -v' for reliable tool detection with
  explicit NO_FFMPEG/NO_WHISPER sentinels
- Use per-run secure temp directory (mktemp -d, mode 0700) instead of
  fixed /tmp/ paths to prevent other users reading extracted frames
- Add -y flag and -loglevel warning to ffmpeg calls to prevent
  overwrite prompts and avoid piping hiding exit codes
- Add whisper-cpp CLI invocation path so users who install only
  whisper-cpp get working transcription
- Fix grouped command syntax in environment fingerprint to prevent
  false 'not installed' fallthrough

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

plugins/automate-this/.github/plugin/plugin.json

@@ -0,0 +1,23 @@
+{
+  "name": "automate-this",
+  "description": "Record your screen doing a manual process, drop the video on your Desktop, and let Copilot CLI analyze it frame-by-frame to build working automation scripts. Supports narrated recordings with audio transcription.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Awesome Copilot Community"
+  },
+  "repository": "https://github.com/github/awesome-copilot",
+  "license": "MIT",
+  "keywords": [
+    "automation",
+    "screen-recording",
+    "workflow",
+    "video-analysis",
+    "process-automation",
+    "scripting",
+    "productivity",
+    "copilot-cli"
+  ],
+  "skills": [
+    "./skills/automate-this/"
+  ]
+}