Expand InnerSource and AI section with agentic coding topics

[jeffabailey]

Summary

• Expands the InnerSource and AI section with content from ispo-working-group#200, covering agentic/vibe coding, the future of software reuse, agent skills, emerging standards (MCP, A2A, agents.md), AI slop risks, and short-term speed vs long-term quality tradeoffs.
• This is submitted as a PR rather than a direct push so the new PR preview feature can generate a preview site for reviewers to see how the content renders before merging.

Further refinement opportunities

• The emerging standards section (MCP, A2A, agents.md, Agent Skills) will evolve quickly — links and descriptions should be revisited as these standards mature.
• The agent skills content could be expanded into a dedicated page with concrete examples of encoding enterprise standards as skills.
• The "future of software reuse" discussion could benefit from real-world case studies as organizations gain more experience with agentic coding.
• The risks section could be expanded with specific mitigation patterns, potentially linking to new InnerSource Patterns as they emerge.
• Author attributions may need updating — Fei Wan's contribution on agent skills could be expanded with more detail if available.

Test plan

• Verify mdBook builds cleanly
• Review PR preview site for correct rendering and navigation
• Check that all new links (MCP, A2A, agents.md, Agent Skills) resolve correctly

🤖 Generated with Claude Code

[github-actions]

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