Refresh guide for late-April OpenClaw releases

[OnlyTerp]

Summary

Refreshes the guide for the late-April OpenClaw release wave, moving the baseline from 2026.4.15 to 2026.4.27 stable with 2026.4.29-beta.1 tracked. This removes stale Claude subscription-era and /models add advice, adds a new Part 33 field guide, updates provider/model/memory/security guidance across the existing parts, modernizes example templates for current config/catalog patterns, and addresses review feedback on config consistency and hook wiring completeness.

Sources / release notes used during the refresh:

• https://openclawai.io/changelog
• https://clawdocs.org/
• https://docs.openclaw.ai/automation/hooks.md
• https://openclawai.io/blog/openclaw-task-brain-v2026-3-31-control-plane-security
• https://github.com/openclaw/openclaw

Type of change

• Correction to an existing part
• Version bump (OpenClaw version)
• New part
• Benchmark / data addition
• Tooling / CI / meta

Review checklist

• Added or updated cross-links from the README TOC and any related parts
• Sources / release notes linked in the PR description (not inline as footnotes)
• Ran markdownlint-cli2 and lychee --offline locally (CI will also run these)
• No speculation presented as fact — any uncertainty is called out in the PR description

Notes / flagged items

• markdownlint-cli2 "**/*.md" "#node_modules" passed locally.
• lychee --offline --no-progress --verbose --config lychee.toml '**/*.md' passed locally.
• CI initially failed because lychee 0.23 expects include_fragments as a boolean while local 0.24 expects a string enum; the config now leaves that version-sensitive key unset so both versions can parse it.
• Review bot findings addressed in commits 748e269, 666514c, 318e192, and c706612.
• mkdocs build --strict still fails on the repo's pre-existing site layout because MkDocs defaults to a missing docs/ directory and does not allow docs_dir: .; the PR docs-quality checks do not run that Pages workflow on pull requests.

Link to Devin session: https://app.devin.ai/sessions/6a8f855a204a46ab9498459a6fa33401
Requested by: @OnlyTerp

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