chore: standardize algorithm collection provenance wording

Author: michaelbawuah

tools/cp.py

@@ -108,8 +108,8 @@ def generated_docs():
     progress = ['# Progress', '', f'- Reference implementations: **{len(entries)}**.',
                 '- Official acceptances: see the evidence ledger in `data/acceptances.json`.',
                 '- Contest results: see `contests/`; no results are implied by this archive.', '',
-                'The starter set was built with AI assistance. A reference file is not a record of a personal solve.',
-                'Track your own attempt, explanation, and judge submission as you work through the practice route.', '',
+                'This repository is my maintained C++ algorithm reference collection; reference implementations and judge evidence are tracked separately.',
+                'Use the practice route to attempt problems, compare approaches, study explanations, and record verified submissions when available.', '',
                 '## Record an acceptance', '',
                 'Add an entry to `data/acceptances.json`, using your real handle and submission URL:', '',
                 '```json', '{', '  "problem_id": "cses-1083",', '  "handle": "your-handle",',