Create-issue skill: Haiku delegation, 68% leaner instructions, eval suite

[oto-macenauer-absa]

Problem

The create-issue skill (added in b37262d) has several areas for improvement:

1. Token cost — 347 lines of skill instructions loaded into context on every invocation; template discovery runs on the expensive primary model
2. Narrow triggers — only activates on "create an issue", misses natural variations like "log a bug" or "submit a ticket"
3. Shell fragility — uses --body-file - with stdin heredocs that break on PowerShell and special characters in markdown
4. No test coverage — no eval suite to measure quality or catch regressions

Acceptance criteria

• Template discovery delegated to Haiku subagent (cheaper model)
• Instruction footprint reduced (target: <120 lines total across all files)
• Trigger description covers common synonyms (bug report, ticket, problem, etc.)
• Issue body posting works across PowerShell and Bash without quoting failures
• Eval suite with at least 3 scenarios (bug, deep context, cross-repo)
• Measured pass rate >= 95%