feat: expand platform coverage with 8 new adaptors, 7 new CLI agents, and OpenCode skill tools

Phase 1 - OpenCode Integration:
- Add OpenCodeAdaptor with directory-based packaging and dual-format YAML frontmatter
- Kebab-case name validation matching OpenCode's regex spec

Phase 2 - OpenAI-Compatible LLM Platforms:
- Extract OpenAICompatibleAdaptor base class from MiniMax (shared format/package/upload/enhance)
- Refactor MiniMax to ~20 lines of constants inheriting from base
- Add 6 new LLM adaptors: Kimi, DeepSeek, Qwen, OpenRouter, Together AI, Fireworks AI
- All use OpenAI-compatible API with platform-specific constants

Phase 3 - CLI Agent Expansion:
- Add 7 new install-agent paths: roo, cline, aider, bolt, kilo, continue, kimi-code
- Total agents: 11 -> 18

Phase 4 - Advanced Features:
- OpenCode skill splitter (auto-split large docs into focused sub-skills with router)
- Bi-directional skill format converter (import/export between OpenCode and any platform)
- GitHub Actions template for automated skill updates

Totals: 12 --target platforms, 18 --agent paths, 2915 tests passing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -94,6 +94,36 @@ minimax = [
     "openai>=1.0.0",
 ]
 
+# Kimi (Moonshot AI) support (uses OpenAI-compatible API)
+kimi = [
+    "openai>=1.0.0",
+]
+
+# DeepSeek AI support (uses OpenAI-compatible API)
+deepseek = [
+    "openai>=1.0.0",
+]
+
+# Qwen (Alibaba) support (uses OpenAI-compatible API)
+qwen = [
+    "openai>=1.0.0",
+]
+
+# OpenRouter support (uses OpenAI-compatible API)
+openrouter = [
+    "openai>=1.0.0",
+]
+
+# Together AI support (uses OpenAI-compatible API)
+together = [
+    "openai>=1.0.0",
+]
+
+# Fireworks AI support (uses OpenAI-compatible API)
+fireworks = [
+    "openai>=1.0.0",
+]
+
 # All LLM platforms combined
 all-llms = [
     "google-generativeai>=0.8.0",
@@ -306,6 +336,7 @@ skill-seekers-manpage = "skill_seekers.cli.man_scraper:main"
 skill-seekers-confluence = "skill_seekers.cli.confluence_scraper:main"
 skill-seekers-notion = "skill_seekers.cli.notion_scraper:main"
 skill-seekers-chat = "skill_seekers.cli.chat_scraper:main"
+skill-seekers-opencode-split = "skill_seekers.cli.opencode_skill_splitter:main"
 
 [tool.setuptools]
 package-dir = {"" = "src"}