[deep-report] Fix missing agentic-campaigns template reference in sync-templates

[github-actions]

Description: The weekly workflow analysis reports CI failures caused by sync-templates trying to copy a missing .github/agents/agentic-campaigns.agent.md. Update the Makefile target to either add the missing template file or remove the reference so the build does not hard-fail.

Expected Impact: Eliminates a large share of CI failures (build, lint, and cross-platform jobs) and restores baseline CI reliability.

Suggested Agent: CI Failure Doctor

Estimated Effort: Quick (< 1 hour)

Data Source: DeepReport Intelligence Briefing 2026-01-20; discussion #10669 (run §21132567301).

AI generated by DeepReport - Intelligence Gathering Agent

[github-actions]

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