fix: repair corrupted index/log files, fix company_proposal template bugs

- index.md: rebuild with full rejection history and CLO spec
- latest.md: replace garbage with correct cycle state entry
- company_proposal.yml: fix step 1 to output single query (not 3-line text)
  so WebSearcher receives a clean search query instead of multi-line input
- company_proposal.yml: add output_key: index_update to index think step
  so document step source_step: index_update resolves correctly
- strategic_review.yml: add source_step: log_entry to document step
  to be explicit rather than relying on implicit last-step behavior
- research_brief.yml: fix source_step 8->9 (carry forward from prior session)

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

templates/research_brief.yml

@@ -155,7 +155,7 @@ steps:
       - [Title](URL)
 
   - type: document
-    source_step: 8
+    source_step: 9
     dest_path: "deliverables/research/research-{task.id}.md"
     commit_msg: "research: brief for task={task.id}"