[agents] staleness report 27554728029

[github-actions]

Automated staleness check found docs that may need review.

See the staleness report below. For each flagged doc, review the content,
confirm it is still accurate, update lastValidated in the frontmatter,
and merge this PR.

[
  {
    "file": "docs/agents-md-structure.md",
    "title": "AGENTS.md structure",
    "reason": "time + paths",
    "details": [
      "Last validated 2026-03-12, 5 days past 90-day threshold",
      "6 commit(s) touching tracked paths since 2026-03-12"
    ],
    "lastValidated": "2026-03-12",
    "maxAgeDays": 90
  },
  {
    "file": "docs/automation-workflow.md",
    "title": "Automation workflow",
    "reason": "time + paths",
    "details": [
      "Last validated 2026-03-12, 5 days past 90-day threshold",
      "5 commit(s) touching tracked paths since 2026-03-12"
    ],
    "lastValidated": "2026-03-12",
    "maxAgeDays": 90
  },
  {
    "file": "docs/frontmatter-schema.md",
    "title": "Frontmatter schema",
    "reason": "time + paths",
    "details": [
      "Last validated 2026-03-12, 5 days past 90-day threshold",
      "7 commit(s) touching tracked paths since 2026-03-12"
    ],
    "lastValidated": "2026-03-12",
    "maxAgeDays": 90
  },
  {
    "file": "docs/llm-prompt-design-agnostic.md",
    "title": "LLM prompt design (provider-agnostic)",
    "reason": "time",
    "details": [
      "Last validated 2026-03-12, 5 days past 90-day threshold"
    ],
    "lastValidated": "2026-03-12",
    "maxAgeDays": 90
  },
  {
    "file": "docs/llm-prompt-design-claude.md",
    "title": "LLM prompt design for Claude Code",
    "reason": "time + paths",
    "details": [
      "Last validated 2026-03-12, 5 days past 90-day threshold",
      "1 commit(s) touching tracked paths since 2026-03-12"
    ],
    "lastValidated": "2026-03-12",
    "maxAgeDays": 90
  }
]

[semanticdiff-com]

Review changes with