fix: disable additional markdownlint rules for agent prompt files

AGENTS.md files are prose-first (no heading required — MD041), mix
list styles (MD004), and use tight lists in compact docs (MD032).
These are structural choices for agent prompts, not markdown errors.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.markdownlint.yaml

@@ -1,10 +1,13 @@
 # Markdownlint configuration for the agents repo.
-# Agent prompt files intentionally use bare URLs (curl commands),
-# inline HTML (template variables), emphasis-as-headings, and long lines.
-MD013: false  # no-line-length — prompts and ops docs use long lines intentionally
-MD022: false  # no-blanks-around-headings — ops docs use compact heading style
-MD031: false  # no-blanks-around-fences — ops docs use fences inside blockquotes
-MD033: false  # no-inline-html
-MD034: false  # no-bare-urls
-MD036: false  # no-emphasis-as-heading
-MD040: false  # no-fenced-code-language — shell snippets often omit language tag
+# Agent prompt files are structured prose, not standard markdown docs.
+# Many style rules conflict with how agent prompts are intentionally written.
+MD004: false  # ul-style — ops docs mix asterisk and dash list styles
+MD013: false  # line-length — prompts and ops docs use long lines intentionally
+MD022: false  # blanks-around-headings — ops docs use compact heading style
+MD031: false  # blanks-around-fences — ops docs use fences inside blockquotes
+MD032: false  # blanks-around-lists — tight lists used in tables and compact docs
+MD033: false  # inline-html — agent prompts use template variables like <repo>
+MD034: false  # bare-urls — agent prompts contain raw curl command URLs
+MD036: false  # emphasis-as-heading — agent prompts use emphasis for structure
+MD040: false  # fenced-code-language — shell snippets often omit language tag
+MD041: false  # first-line-heading — AGENTS.md files are prose-first by design