docs(features): explain the Claude Code integration from a user view

[jeduden]

Why

The "Editors and agents" feature page
(docs/features/editor-agent-integration.md) was written almost
entirely around the VS Code extension. It named only two of the five
user-facing Claude Code plugins (mdsmith-lsp and the audit skill) and
gave a reader no way to learn what the integration does or how to turn
it on. A user who wants mdsmith in Claude Code left the page no better
informed.

What changed

Reworked the page so the agent story gets concrete, user-facing
coverage, balanced with the editor story:

• Lead with the payoff. One rule engine; the check that gates a CI
  merge is the same one the editor shows you and the same one the agent
  sees as it edits — no second config or ruleset.
• Describe each plugin by what it does for the user: mdsmith-lsp
  (inline diagnostics + navigation), mdsmith-autofix (post-edit
  mdsmith fix hook), the three slash commands (/mdsmith-fix,
  /mdsmith-check, /mdsmith-kinds), the markdown-reviewer subagent,
  and the /markdown-audit skill.
• Show how to use it: the one /plugin marketplace add jeduden/mdsmith
  line, then a link to the install guide's existing
  Claude Code plugins section
  for per-plugin commands and prerequisites.
• Trust signal: noted that mdsmith makes no network call of its own,
  linking the telemetry policy.
• Kept the synced VS Code <?include?> block and the
  progressive-disclosure pairing.

Refreshed summary to reflect the broader integration. That cascades
through the CLAUDE.md catalog and the AGENTS.md /
copilot-instructions.md includes, which were regenerated with
mdsmith fix.

No new doc file was needed — the per-plugin setup steps already live in
the install guide; this page now points there.

Verification

• mdsmith check . passes (519 files, 0 failures).
• Applied the docs-author global-English and anti-slop passes: short
  sentences, no banned vocabulary or openers, no em-dashes in the new
  prose, no bold-label-colon list rhythm.

🤖 Generated with Claude Code

https://claude.ai/code/session_01K1ba2VNTt2KcoVSwmRMBvz

---

Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.63%. Comparing base (86dc716) to head (9696daf).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

Components	Coverage Δ
Go	98.62% <ø> (+<0.01%)	⬆️
TypeScript	99.54% <ø> (ø)

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[jeduden]

🟢 Merge Queue — picked up

This PR is in the queue and will be batched with other queue-labelled PRs.

Next: No action needed — you'll get another comment when CI starts on the batch. View merge queue run.

[jeduden]

🔵 Merge Queue — CI running

Merged into batch branch merge-queue/batch-710-1782761070. View CI run.

Next: No action needed — you'll be notified when CI completes.

[jeduden]

✅ Merge Queue — merged

This PR landed on main via commit 0314c10. CI run that validated the merge.

Next: Done — nothing more to do here.