chore: add markdownlint and fix violations across all markdown files

.markdownlint-cli2.yaml

@@ -0,0 +1,24 @@
+customRules:
+  - ./scripts/markdownlint/no-hard-wraps.cjs
+config:
+  MD013: false
+  MD024:
+    siblings_only: true
+  MD033:
+    allowed_elements:
+      - a
+      - br
+      - details
+      - h1
+      - h3
+      - img
+      - p
+      - picture
+      - source
+      - summary
+  MD041: false
+  MD060:
+    style: compact
+ignores:
+  - "**/node_modules/**"
+  - "packages/coding-agent/dist/**"

AGENTS.md

@@ -199,6 +199,7 @@ Create provider file exporting:
 1. **Update CHANGELOGs**: Ensure all changes since last release are documented in the `[Unreleased]` section of each affected package's CHANGELOG.md
 
 2. **Run release script**:
+
    ```bash
    npm run release:patch    # Fixes and additions
    npm run release:minor    # API breaking changes

README.md

@@ -78,6 +78,7 @@ prime-agent shutdown [--force]       # Stop every agent, worker, and background
 ```
 
 ## Built for Long-Running Work
+
 Prime Agent is built for long-running work, especially for evaluations in research. These features are available in the TUI, and when run autonomously.
 
 - **Continual Harness:** `/refine` can persist focused, reviewable lessons as supplemental prompts, memories, reusable skill descriptions, or subagent specifications, with recorded refinement history. It does not replace packaging and reviewing new executable skills.