docs: reflow hard-wrapped prose to one line per paragraph

Markdown and editors soft-wrap on their own, so the manual ~75-char line
breaks across the docs added nothing but noise. Join wrapped prose, list
items, and paragraphs into single lines across 67 docs — README, CLAUDE.md,
deployment, usage, the RAG knowledge base, and the agent role prompts.
Whitespace-only: code fences, tables, and blockquote alerts are byte-identical
and the change is token-verified (no content altered). Applied with a
deterministic reflow tool (committed separately).

Also lands two doc edits that were awaiting commit: the measured under-load
resource numbers in usage.md and the pr_reviewer additions to the
org-structure RAG doc.

docs/rag/roles/head-marketing.md

@@ -40,8 +40,7 @@
 | `roboco-git-readonly` | `roboco_git_status`, `roboco_git_log`, `roboco_git_diff`, `roboco_git_branch_list` |
 | `roboco-optimal`      | `roboco_ask_mentor`, `roboco_kb_search` |
 
-Your flow surface is deliberately narrow: the Board steers and approves,
-it does not claim, create, or complete tasks.
+Your flow surface is deliberately narrow: the Board steers and approves, it does not claim, create, or complete tasks.
 
 ## Escalation