refactor: move `reportDbgIssue!` from grind to SymM

This PR moves `reportDbgIssue!` and `expandReportDbgIssueMacro` from
`Grind/Types.lean` to `SymM.lean`. The macro now checks `sym.debug`
instead of `grind.debug`, since debug issue reporting is a Sym-level
concern shared across all modules in a `sym =>` block.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
4 files changed