Remove legacy placeholder.cpp files from fully implemented modules

[Copilot]

The implementation-tracker workflow was incorrectly marking 6 modules as "partially implemented" (91%) because they contained both real .cpp implementations and legacy placeholder.cpp files.

Changes

Removed unused placeholder files from modules with complete implementations:

• cpp/external/brandkit/src/placeholder.cpp
• cpp/external/classified/src/placeholder.cpp
• cpp/external/hat/src/placeholder.cpp
• cpp/external/the_org/src/placeholder.cpp
• cpp/packages/plugins/eliza_plugin_starter/src/placeholder.cpp
• cpp/packages/starters/eliza_nextjs_starter/src/placeholder.cpp

These files contained only empty stubs like:

namespace elizaos {
    void brandkit_placeholder() {
        // Placeholder std::function to make library linkable
    }
}

Impact

Metric	Before	After
Fully Implemented	61	67
Partially Implemented	6	0

No CMakeLists.txt files reference these placeholder files—all modules use their real implementation files (e.g., brandkit.cpp, the_org_impl.cpp).

Original prompt

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This section details on the original issue you should resolve

<issue_title>📊 ElizaOS C++ Implementation Progress Tracking</issue_title>
<issue_description># Implementation Progress Tracking

This issue tracks the ongoing progress of converting placeholder modules to full implementations.

📊 ElizaOS C++ Implementation Progress Report

Generated: 2026-01-21 07:17 UTC
Commit: ef07b26

Current Status

Category	Count	Percentage
✅ Fully Implemented	61	91%
🟡 Partially Implemented	6	8%
🚧 Placeholder Only	0	0%
Total Modules	67	100%

📈 Overall Completion: 91%

✅ Fully Implemented Modules

• LiveVideoChat
• SWEagent
• agentaction
• agentagenda
• agentbrowser
• agentcomms
• agentlogger
• agentloop
• agentmemory
• agentshell
• aum_tracker
• auto_fun
• autofun_idl
• autonomous_starter
• awesome_eliza
• characterfile
• characters
• core
• discord_summarizer
• discrub_ext
• easycompletion
• eliza
• eliza_3d_hyperfy_starter
• eliza_starter
• elizaos_github_io
• elizas_list
• elizas_world
• embodiment
• evolutionary
• generated_api
• generated_auth
• generated_cli
• generated_database
• generated_docs
• generated_misc
• generated_plugins
• generated_services
• generated_testing
• generated_trade
• generated_ui
• generated_utils
• generated_websocket
• goal_manager
• hats
• knowledge
• livevideochat
• ljspeechtools
• mcp_gateway
• otaku
• otc_agent
• plugin_specification
• plugins_automation
• registry
• sandbox_template_cloud
• spartan
• sweagent
• test_hybrid
• trust_scoreboard
• vercel_api
• website
• workgroups

🟡 Partially Implemented Modules

• brandkit (has both real implementation and placeholder)
• classified (has both real implementation and placeholder)
• eliza_nextjs_starter (has both real implementation and placeholder)
• eliza_plugin_starter (has both real implementation and placeholder)
• hat (has both real implementation and placeholder)
• the_org (has both real implementation and placeholder)

🚧 Placeholder Only Modules (Implementation Needed)

• ``

🎯 Next Priority Implementations

Based on the Implementation Roadmap, the highest priority modules for implementation are:

1. agentbrowser - Web automation capabilities
2. eliza - Core conversation engine
3. characters - Character and personality management
4. knowledge - Knowledge base and retrieval
5. ljspeechtools - Speech processing capabilities

---

This report is automatically generated by the Implementation Progress Tracker workflow.
</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: elizaos-cpp
ElizaOS C++ - High-Performance Cognitive Agent Framework

• Fixes 📊 ElizaOS C++ Implementation Progress Tracking #15

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[danregima]

cooolk