wire builtin.pql + builtin.problems panels

PqlExtension contributes a sidebar tab (files, query, decisions,
tickets views) and a context-panel tab (backlinks + outlinks for
the active file, auto-refreshing on editor.active-changed).

ProblemsExtension contributes a sidebar tab aggregating pql.doctor
and decisions.sync diagnostics with actionable hints.

Both upgraded from stubs to 0.1.0.

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/settings.json

@@ -3,6 +3,28 @@
     "allow": [
       "Bash(git add *)",
       "Bash(git commit *)",
+      "Bash(git status *)",
+      "Bash(git diff *)",
+      "Bash(git log *)",
+      "Bash(git show *)",
+      "Bash(git branch *)",
+      "Bash(git checkout *)",
+      "Bash(git switch *)",
+      "Bash(git merge *)",
+      "Bash(git rebase *)",
+      "Bash(git stash *)",
+      "Bash(git fetch *)",
+      "Bash(git pull *)",
+      "Bash(git push *)",
+      "Bash(git tag *)",
+      "Bash(git remote *)",
+      "Bash(git rev-parse *)",
+      "Bash(git symbolic-ref *)",
+      "Bash(git ls-remote *)",
+      "Bash(git config *)",
+      "Bash(git blame *)",
+      "Bash(git shortlog *)",
+      "Bash(git cherry-pick *)",
       "Bash(dart *)",
       "Bash(flutter *)",
       "Bash(make *)",