fix(okf): satisfy super-linter markdown rules

[duyet]

Fixes the failing Lint workflow on master.

Violations (run 27490491080):

• okf/skills/okf/reference/SPEC.md:9 — MD034/no-bare-urls
• okf/skills/okf/reference/SPEC.md:29,169 — MD040/fenced-code-language
• MARKDOWN_PRETTIER — formatting in okf/skills/okf/SKILL.md and okf/skills/okf/reference/SPEC.md

Fix:

• Wrap the bare spec source URL in angle brackets.
• Add text language to the two directory-tree code fences.
• Apply Prettier formatting (list markers, table padding, blank lines around lists, *→_ for emphasis) to both files.

No Sync skills changes (that workflow is a separate deferred issue).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: e0d7aa4f-8ec9-4dc6-bd49-66dd61e6895a

📥 Commits

Reviewing files that changed from the base of the PR and between 97b7324 and fa0776e.

📒 Files selected for processing (2)

• okf/skills/okf/SKILL.md
• okf/skills/okf/reference/SPEC.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/okf-markdown-lint

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