fix(voice/consistency): vary stock formulas, vendor-balance orient.py, unify the loop

- Vary 11 instances of two boilerplate openers ("A generic X course…" /
  "Strip away X…") across 10 modules so they read as distinct, concrete prose;
  kept the few deliberate, voice-distinct uses; locked exemplars untouched.
- M23 orient.py: detect a vendor-balanced set of AI-instruction filenames
  (AGENTS.md/CLAUDE.md/GEMINI.md/.cursorrules/.cursor/rules/copilot-instructions)
  instead of singling out one vendor. Still runs.
- Render the collaboration loop consistently as seven stations
  (issue->branch->implementation->PR->review->merge->closed) in M25/M26 to match
  M11 and the syllabus.

Closes #48
Closes #49
Closes #51

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

modules/08-remotes-and-hosting/README.md

@@ -42,8 +42,8 @@ By the end of this module you can:
 
 ### A remote is just another copy
 
-Strip the branding away and a **remote** is one thing: a named reference to *another copy of this
-same repository*, usually somewhere you can reach over the network. That's it. `origin` is not a
+A **remote** is a named reference to *another copy of this same repository*, usually somewhere you
+can reach over the network. That's it. `origin` is not a
 GitHub concept, a GitLab concept, or a Gitea concept — it's a Git concept, and the copy it points at
 is a full, equal Git repo that happens to live on a server.