chore(hypatia): exempt examples/SafeDOMExample.res from banned-language scanner (#43)

## Summary

Adds `.hypatia-ignore` with a single carve-out for
`examples/SafeDOMExample.res` so dependabot bumps and unrelated PRs
aren't blocked by an existing ReScript file pending the AffineScript
migration.

## Why

The governance bundle's banned-language scanner flags
`examples/SafeDOMExample.res` on every PR (see e.g. dependabot #67 —
`actions/github-script` 8→9 was blocked by this exact failure). The file
is in scope for the ReScript→AffineScript migration tracked in
affinescript#57; until that conversion lands, the right move is to
exempt it explicitly so it doesn't block unrelated work.

## What

- Adds `.hypatia-ignore` with one entry:
`cicd_rules/banned_language_file:examples/SafeDOMExample.res`
- Header comment explains the format and references the migration
tracker

## Effect on #67

Once this merges, the `governance / Language / package anti-pattern
policy` job on the next CI run for #67 (and any other open PR) will
treat the file as acknowledged, no longer blocking.

## Test plan
- [ ] CI: governance Language anti-pattern policy passes on this PR
- [ ] Trigger a re-run of #67 to confirm it now goes green

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.hypatia-ignore

@@ -0,0 +1,10 @@
+# Hypatia governance bundle exemptions
+# Format: <rule>:<path> — whole-line fixed-string match (grep -qxF)
+# Detail: hyperpolymath/standards/.github/workflows/governance-reusable.yml `is_exempt()`
+#
+# examples/SafeDOMExample.res — pre-existing ReScript example, scheduled for
+# ReScript→AffineScript migration tracked in the affinescript#57 corpus run.
+# Keeping the example until the migration assistant is ready to convert it
+# in-place; flagging it as a banned-language file would block unrelated PRs
+# (e.g. dependabot bumps).
+cicd_rules/banned_language_file:examples/SafeDOMExample.res