docs: repoint the doc comments at the marker they describe

The store moved to `.kettle/` when the binary replaced the plugin's scripts, but
six doc comments in the domain and the project layer still showed `.tea/` paths
in their examples. The code was right and the prose was a version behind, which
is the failure mode worth catching early: these are the comments somebody reads
to learn where the store IS.

The `.tea/` that remain are the ones that mean it — the legacy migration list
and the tests that exercise it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

cli/internal/issue/issue.go

@@ -13,7 +13,7 @@
 // Identity is a slug derived from the title, and it is the only identity the
 // domain has. The file name is the id:
 //
-//	.tea/issues/wire-sqlc-appclick.md
+//	.kettle/issues/wire-sqlc-appclick.md
 //
 //	---
 //	id: wire-sqlc-appclick
@@ -40,8 +40,8 @@
 // Every metadata field is one line and lists are inline, so plain grep works
 // without a parser:
 //
-//	grep -l 'labels:.*type/bug' .tea/issues/*.md
-//	grep -ln 'depends:.*migrate-schema' .tea/issues/*.md   # who depends on it
+//	grep -l 'labels:.*type/bug' .kettle/issues/*.md
+//	grep -ln 'depends:.*migrate-schema' .kettle/issues/*.md   # who depends on it
 package issue
 
 import (