The gsd-phase-researcher and gsd-project-researcher agents instructed
WebSearch queries to always include 'current year' (e.g., 2024). As
time passes, a hardcoded year biases search results toward stale
dated content — users saw 2024-tagged queries producing stale blog
references in 2026.
Remove the year-injection guidance. Instead, rely on checking
publication dates on the returned sources. Query templates and
success criteria updated accordingly.
Closes#2559