docs: drop the webkit2_41 tag from the commands agents run

The commit before this removed the tag from the Makefile, lefthook,
both packaging recipes and CI, but left it in CLAUDE.md's "Running
tests" section and the yellowjacket-dev skill — which are the copies a
coding agent actually runs, so a stale tag there is worse than one in
prose. skill-check does not catch this: it verifies that documented
make targets exist, not that documented go commands do.

The historical mentions in .planning/ and .pi/journal.md are left
alone; they are records of what was true then.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UDCbcCZQepnpSQYJ6SxxZm

.pi/skills/yellowjacket-dev/SKILL.md

@@ -387,10 +387,10 @@ never get the shell back.
 when iterating on a single package:
 
 ```bash
-go test -tags webkit2_41 ./backend/player/                        # the app build
-go test -tags webkit2_41 -run TestName ./backend/player/
-go test -tags "webkit2_41 indexbuild" ./backend/explore/... ./cmd/...   # dump importer
-go test -tags "webkit2_41 dev" ./backend/testctl/...              # control surface
+go test ./backend/player/                        # the app build
+go test -run TestName ./backend/player/
+go test -tags indexbuild ./backend/explore/... ./cmd/...   # dump importer
+go test -tags dev ./backend/testctl/...              # control surface
 ```
 
 Forgetting the tag gives a build error that looks like a missing

.pi/skills/yellowjacket-dev/references/schema-change.md

@@ -35,7 +35,7 @@ Then:
 
 ```bash
 make generate                                        # sqlc + templ
-go test -tags webkit2_41 ./backend/database/         # migration + column-order tests
+go test ./backend/database/         # migration + column-order tests
 make test
 ```