chore(governance): declare the banned-language migration backlog

The "Language / package anti-pattern policy" gate is failing on 5
file(s) in banned languages (5 rescript).

The gate is CORRECT — these really are languages estate policy bans. But
deleting them would destroy working code without porting it, so this uses the
mechanism the gate's own failure message names:

    (declare an exemption via .hypatia-ignore ... if intentional)

Every path is listed individually rather than by wildcard. A `src/**` entry
would silently absorb NEW banned files added later, turning a migration ledger
into a permanent blind spot. Listing each path means a newly added file still
fails the gate: this ledger can only shrink as work is done.

It therefore doubles as the migration worklist.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>

Author: hyperpolymath

.hypatia-ignore

@@ -0,0 +1,29 @@
+# Banned-language exemption ledger — hypatia / governance-reusable.yml
+#
+# Format: <rule_module>/<rule_type>:<path>
+#
+# WHY THIS FILE EXISTS
+# --------------------
+# The governance "Language / package anti-pattern policy" gate is correct:
+# these files really are in languages estate policy bans. The gate's own
+# failure message names this file as the sanctioned way to declare an
+# intentional exception.
+#
+# These exemptions HOLD THE LINE WHILE MIGRATION IS IN PROGRESS. Each entry
+# is removed as the matching file is ported or deleted. This follows the
+# precedent set in hyperpolymath/echidna.
+#
+# EVERY PATH IS LISTED INDIVIDUALLY — deliberately. A `src/**` wildcard would
+# silently absorb NEW banned files added later, turning a migration ledger into
+# a permanent blind spot. Listing each path means a newly added file still
+# fails the gate: this ledger can only shrink as work is done, never quietly
+# grow.
+#
+# Inventory taken 2026-08-06 across all 424 estate repositories.
+# Files covered: 5 rescript
+
+cicd_rules/banned_language_file:ui/src/App.res
+cicd_rules/banned_language_file:ui/src/Model.res
+cicd_rules/banned_language_file:ui/src/Msg.res
+cicd_rules/banned_language_file:ui/src/RuntimeBridge.res
+cicd_rules/banned_language_file:ui/src/components/FormatTabs.res