Agent Skills: win-report

Discover and synthesize engineering wins from GitHub PRs/issues, Confluence, Jira, Notion, and Slack over a configurable time range. Uses exhaustive two-phase subagent architecture to paginate all sources and read all artifacts in full before synthesizing. Produces a structured markdown report of top wins with evidence, impact, and ownership. Use when the user says "/win-report", "summarize my wins", "what did I ship last month", "monthly wins report", "generate wins for performance review", or asks for a summary of their recent engineering contributions.