Add generic agent support with customizable command directories (#1639)

- Add --ai generic option for unsupported AI agents (bring your own agent)
- Require --ai-commands-dir to specify where agent reads commands from
- Generate Markdown commands with $ARGUMENTS format (compatible with most agents)
- Rebuild CHANGELOG from GitHub releases (last 10 releases)
- Align version to 0.1.3

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/scripts/create-release-packages.ps1

@@ -14,7 +14,7 @@
 
 .PARAMETER Agents
     Comma or space separated subset of agents to build (default: all)
-    Valid agents: claude, gemini, copilot, cursor-agent, qwen, opencode, windsurf, codex, kilocode, auggie, roo, codebuddy, amp, q, bob, qoder
+    Valid agents: claude, gemini, copilot, cursor-agent, qwen, opencode, windsurf, codex, kilocode, auggie, roo, codebuddy, amp, q, bob, qoder, generic
 
 .PARAMETER Scripts
     Comma or space separated subset of script types to build (default: both)
@@ -347,6 +347,10 @@ function Build-Variant {
             $cmdDir = Join-Path $baseDir ".qoder/commands"
             Generate-Commands -Agent 'qoder' -Extension 'md' -ArgFormat '$ARGUMENTS' -OutputDir $cmdDir -ScriptVariant $Script
         }
+        'generic' {
+            $cmdDir = Join-Path $baseDir ".speckit/commands"
+            Generate-Commands -Agent 'generic' -Extension 'md' -ArgFormat '$ARGUMENTS' -OutputDir $cmdDir -ScriptVariant $Script
+        }
     }
     
     # Create zip archive
@@ -356,7 +360,7 @@ function Build-Variant {
 }
 
 # Define all agents and scripts
-$AllAgents = @('claude', 'gemini', 'copilot', 'cursor-agent', 'qwen', 'opencode', 'windsurf', 'codex', 'kilocode', 'auggie', 'roo', 'codebuddy', 'amp', 'q', 'bob', 'qoder')
+$AllAgents = @('claude', 'gemini', 'copilot', 'cursor-agent', 'qwen', 'opencode', 'windsurf', 'codex', 'kilocode', 'auggie', 'roo', 'codebuddy', 'amp', 'q', 'bob', 'qoder', 'generic')
 $AllScripts = @('sh', 'ps')
 
 function Normalize-List {