docs(readme): reflect EtcdDefragPolicy scheduled defrag

[Andrey Kolkov (androndo)]

Follow-up to #363 (EtcdDefragPolicy, merged). The README predated it and still claimed scheduled defragmentation was unsupported.

What

• What's not supported — drop No defragmentation scheduling. It's now provided by EtcdDefragPolicy. The neighbouring no scheduled snapshot CRD gap stays (still true).
• Docs index — the Defragmentation link now names EtcdDefrag / EtcdDefragPolicy and says one-shot or on an operator-driven cron schedule instead of only driven from outside on a schedule, matching the updated docs/etcd-defrag.md.

Docs-only; no code or generated files touched.

```release-note
NONE
```

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated defragmentation documentation to describe one-shot defragmentation and operator-driven cron scheduling.
  • Documented the EtcdDefragPolicy configuration option.
  • Removed outdated information stating that defragmentation scheduling is unsupported.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between a3d1b19 and 79a0281.

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• README.md

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📝 Walkthrough

Walkthrough

The README now documents EtcdDefragPolicy resources and operator-driven cron scheduling. It no longer lists defragmentation scheduling as unsupported.

Changes

Defragmentation documentation

Layer / File(s)	Summary
Update defragmentation support documentation README.md	The unsupported-features list removes defragmentation scheduling. The defragmentation entry documents EtcdDefragPolicy resources and operator-driven cron scheduling.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 79a02

This documentation-only change updates the README to reflect supported scheduled defragmentation without changing product behavior; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: lllamnyp

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the README documentation update for scheduled defragmentation through EtcdDefragPolicy. It is concise and directly matches the primary change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-defrag-scheduling

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