docs: consolidate Community sections in README (#2736)

* docs: consolidate Community sections in README

Replace four separate Community sections (Extensions, Presets,
Walkthroughs, Friends) with a single consolidated section containing
a bullet list, one shared disclaimer, and both publishing guide links.

* fix: broken community anchor links and missing Hermes hook note injection

- Update README.md and extensions/README.md to point community
  extension links to the docs site instead of removed section anchor
- Add post_process_skill_content() call in Hermes setup() so hook
  command notes are injected into generated skills
- Add Hermes test override for test_hook_sections_explain_dotted_command_conversion
  with Path.home() monkeypatch

README.md

@@ -22,10 +22,7 @@
 - [🤔 What is Spec-Driven Development?](#-what-is-spec-driven-development)
 - [⚡ Get Started](#-get-started)
 - [📽️ Video Overview](#️-video-overview)
-- [🧩 Community Extensions](#-community-extensions)
-- [🎨 Community Presets](#-community-presets)
-- [🚶 Community Walkthroughs](#-community-walkthroughs)
-- [🛠️ Community Friends](#️-community-friends)
+- [🌍 Community](#-community)
 - [🤖 Supported AI Coding Agent Integrations](#-supported-ai-coding-agent-integrations)
 - [🔧 Specify CLI Reference](#-specify-cli-reference)
 - [🧩 Making Spec Kit Your Own: Extensions & Presets](#-making-spec-kit-your-own-extensions--presets)
@@ -112,31 +109,19 @@ Want to see Spec Kit in action? Watch our [video overview](https://www.youtube.c
 
 [![Spec Kit video header](/media/spec-kit-video-header.jpg)](https://www.youtube.com/watch?v=a9eR1xsfvHg&pp=0gcJCckJAYcqIYzv)
 
-## 🧩 Community Extensions
+## 🌍 Community
 
-Community-contributed extensions add new commands, hooks, and capabilities to Spec Kit. See the full list on the [Community Extensions](https://github.github.io/spec-kit/community/extensions.html) page.
+Explore community-contributed resources on the [Spec Kit docs site](https://github.github.io/spec-kit/):
+
+- [Extensions](https://github.github.io/spec-kit/community/extensions.html) — commands, hooks, and capabilities
+- [Presets](https://github.github.io/spec-kit/community/presets.html) — template and terminology overrides
+- [Walkthroughs](https://github.github.io/spec-kit/community/walkthroughs.html) — end-to-end SDD scenarios
+- [Friends](https://github.github.io/spec-kit/community/friends.html) — projects that extend or build on Spec Kit
 
 > [!NOTE]
-> Community extensions are independently created and maintained by their respective authors. Maintainers only verify that catalog entries are complete and correctly formatted — they do **not review, audit, endorse, or support the extension code itself**. Review extension source code before installation and use at your own discretion.
+> Community contributions are independently created and maintained by their respective authors. Review source code before installation and use at your own discretion.
 
-To submit your own extension, see the [Extension Publishing Guide](extensions/EXTENSION-PUBLISHING-GUIDE.md).
-
-## 🎨 Community Presets
-
-Community-contributed presets customize how Spec Kit behaves — overriding templates, commands, and terminology without changing any tooling. See the full list on the [Community Presets](https://github.github.io/spec-kit/community/presets.html) page.
-
-> [!NOTE]
-> Community presets are third-party contributions and are not maintained by the Spec Kit team. Review them carefully before use, and see the docs page above for the full disclaimer.
-
-To submit your own preset, see the [Presets Publishing Guide](presets/PUBLISHING.md).
-
-## 🚶 Community Walkthroughs
-
-See Spec-Driven Development in action across different scenarios with community-contributed walkthroughs; find the full list on the [Community Walkthroughs](https://github.github.io/spec-kit/community/walkthroughs.html) page.
-
-## 🛠️ Community Friends
-
-Community projects that extend, visualize, or build on Spec Kit. See the full list on the [Community Friends](https://github.github.io/spec-kit/community/friends.html) page.
+Want to contribute? See the [Extension Publishing Guide](extensions/EXTENSION-PUBLISHING-GUIDE.md) or the [Presets Publishing Guide](presets/PUBLISHING.md).
 
 ## 🤖 Supported AI Coding Agent Integrations
 
@@ -206,7 +191,7 @@ specify extension add <extension-name>
 
 For example, extensions could add Jira integration, post-implementation code review, V-Model test traceability, or project health diagnostics.
 
-See the [Extensions reference](https://github.github.io/spec-kit/reference/extensions.html) for the full command guide. Browse the [community extensions](#-community-extensions) above for what's available.
+See the [Extensions reference](https://github.github.io/spec-kit/reference/extensions.html) for the full command guide. Browse the [community extensions](https://github.github.io/spec-kit/community/extensions.html) for what's available.
 
 ### Presets — Customize Existing Workflows