AI Hero skills add issue-tracker support

This looks less like a gimmick update and more like a push to make skills a portable operating layer for agent workflows.

• –Deprecating `/ubiquitous-language` in favor of `/grill-with-docs` suggests the naming is converging on clearer, more task-specific commands
• –Splitting `/grill-with-docs` for codebases and `/grill-me` for broader contexts makes the system feel less generic and more opinionated
• –Any-issue-tracker support is the practical win: it lowers adoption friction for teams already living in Jira, Linear, GitHub Issues, or similar systems
• –`/diagnose` and `/triage` hint at a move from planning assistance toward operational maintenance, where agents help classify and debug work instead of only drafting it
• –The newsletter callout implies this is an evolving ecosystem, not a one-off release, so expect the skill set to keep changing quickly