Step 7: Remove scaffold agent fallback infrastructure

[ggallen]

Context

Step 7 of the agent extraction plan removes scaffold-based agent resolution infrastructure now that all six first-party agents are extracted to fullsend-ai/agents and registered in org config (Steps 1–6 complete).

Tracking

Completed (PR #5425)

• Remove MergedAgents, LookupMergedAgent, HarnessWrappersLayer, AgentEntryBuilder, DefaultAgentEntries, configAgentNames
• Remove disk-based harness fallback from resolveAgentSource
• Simplify to 2-tier model: config → agents-repo fallback
• Update plan docs and ADRs with removal annotations

Remaining (follow-up PRs)

• Item 1: Delete scaffold harness YAML files (internal/scaffold/fullsend-repo/harness/)
• Item 5: Remove HarnessNames() / HarnessBaseURLWithHash() after migrate.go no longer needs them
• Item 6: Update fullsend lock to be config/agents-repo-aware (currently disk-only via resolveHarnessPath)
• Item 7: Delete remaining scaffold agent files (agents/, env/, policies/, schemas/, scripts/, skills/)
• Item 8: Update Makefile and test infrastructure

Prerequisites verified

All installations have config-driven agent entries. The agents-repo fallback covers the 6 known first-party agents for online environments. See PR #5425 description for full migration prerequisite verification.

[fullsend-ai-triage]

🤖 Finished Triage · ✅ Success · Started 10:09 PM UTC · Completed 10:12 PM UTC
Commit: 3eb6a6e · View workflow run →

[fullsend-ai-triage]

Triage Summary

This is a tracking issue for Step 7 of the agent extraction plan. PR #5425 is currently open and addresses the first batch of work (removing MergedAgents, LookupMergedAgent, HarnessWrappersLayer, AgentEntryBuilder, DefaultAgentEntries, configAgentNames, simplifying to a 2-tier resolution model, and updating plan docs/ADRs).

The remaining items (scaffold YAML deletion, HarnessNames/HarnessBaseURLWithHash removal, fullsend lock update, scaffold agent file deletion, and Makefile/test updates) are planned as follow-up PRs that depend on PR #5425 merging first.

Blocked on: PR #5425 must be merged before the remaining follow-up items can proceed. Once it lands, the five remaining items can be tackled as independent follow-up PRs.

Blocked by:

• refactor(harness): remove scaffold agent fallback infrastructure #5425

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Labels: This issue tracks scaffold removal infrastructure work (component/harness) and is a tech-debt cleanup task. Marking as blocked since PR #5425 must merge first.