chore: remove advertising gallery and purge local transcript prompts (#163)

* refactor: remove advertising proof gallery and campaign guide; purge session transcript prompts

Removes the 'Grounded, not guessed' proof gallery link and campaign guide
references from README.md. Deletes docs/advertising/ (index.html, campaign.md)
and tests/test_advertising_assets.py. Removes pROMPT_SESSION_TRANSCRIPT_ANALYSIS.md
and session_transcript_query_prompt.md (working prompts that inspect private
~/.commandcode/ session data). Adds all four filenames to .gitignore.

* restore canonical main README (mojibake corruption in dd89e16)

* docs: drop dead advertising links after gallery removal

---------

Co-authored-by: coding-dev-tools <coding-dev-tools@users.noreply.github.com>

Author: Coding-Dev-Tools

.gitignore

@@ -132,3 +132,8 @@ uv.lock
 /stats_pm2.txt
 /venv_status.txt
 /r3.txt
+
+# Local Command Code session-transcript analysis prompts — inspect private
+# ~/.commandcode/ session data, never commit these.
+/pROMPT_SESSION_TRANSCRIPT_ANALYSIS.md
+/session_transcript_query_prompt.md

README.md

@@ -16,7 +16,7 @@
   <sup>Knowledge Graph · run <code>engraphis-dashboard</code> to see it live</sup>
 </p>
 
-**Grounded, not guessed.** Memory with receipts. Local by default. [Explore the proof gallery](https://github.com/Coding-Dev-Tools/engraphis/tree/main/docs/advertising) or [read the campaign guide](https://github.com/Coding-Dev-Tools/engraphis/blob/main/docs/advertising/campaign.md).
+**Grounded, not guessed.** Memory with receipts. Local by default.
 
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