[extension] Update Spec Kit Preview extension to v1.1.0 and sync Firebender agent lists (#3116)

* Update Spec Kit Preview extension to v1.1.0

Update preview extension submitted by @bigsmartben to:
- extensions/catalog.community.json (version, name, description, download_url, commands, tags, updated_at)
- docs/community/extensions.md community extensions table (name, description, alphabetical order)

Closes #3109

Assisted-by: GitHub Copilot (model: claude-sonnet-4.6, autonomous)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Sync issue templates with firebender integration

Assisted-by: GitHub Copilot (model: GPT-5, autonomous)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Manfred Riem <15701806+mnriem@users.noreply.github.com>

.github/ISSUE_TEMPLATE/agent_request.yml

@@ -8,7 +8,7 @@ body:
       value: |
         Thanks for requesting a new agent! Before submitting, please check if the agent is already supported.
         
-        **Currently supported agents**: Amp, Antigravity, Auggie CLI, Claude Code, Cline, CodeBuddy, Codex CLI, Cursor, Devin for Terminal, Forge, Gemini CLI, GitHub Copilot, Goose, Hermes Agent, IBM Bob, iFlow CLI, Junie, Kilo Code, Kimi Code, Kiro CLI, Lingma, Mistral Vibe, opencode, Pi Coding Agent, Qoder CLI, Qwen Code, Roo Code, RovoDev ACLI, SHAI, Tabnine CLI, Trae, Windsurf, ZCode, Zed
+        **Currently supported agents**: Amp, Antigravity, Auggie CLI, Claude Code, Cline, CodeBuddy, Codex CLI, Cursor, Devin for Terminal, Firebender, Forge, Gemini CLI, GitHub Copilot, Goose, Hermes Agent, IBM Bob, iFlow CLI, Junie, Kilo Code, Kimi Code, Kiro CLI, Lingma, Mistral Vibe, opencode, Pi Coding Agent, Qoder CLI, Qwen Code, Roo Code, RovoDev ACLI, SHAI, Tabnine CLI, Trae, Windsurf, ZCode, Zed
 
   - type: input
     id: agent-name

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -71,6 +71,7 @@ body:
         - Codex CLI
         - Cursor
         - Devin for Terminal
+        - Firebender
         - Forge
         - Gemini CLI
         - GitHub Copilot

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -65,6 +65,7 @@ body:
         - Codex CLI
         - Cursor
         - Devin for Terminal
+        - Firebender
         - Forge
         - Gemini CLI
         - GitHub Copilot