fix(review): name each lens section, as crafter-review 1.0 requires

crafter-review 1.0.1, the released build installed on this machine, and
the newer build installed beside it as //local refuse the config key
lensSections: a lens's repository section is named per lens, as
lenses.<name>.section, instead of being found by listing a directory.
With the key in place `crafter-review config` reports it as a problem,
and freeze and run stop at "preflight: config: unknown key lensSections".

The three files in .review-gates/lenses/ are named under lenses, one
entry each, the migration the Crafter.Review session gave; with them
`crafter-review config` reports no problem.

.review-gates/config.json

@@ -6,7 +6,17 @@
   ],
   "aiTrailers": "forbid",
   "requireSigned": true,
-  "lensSections": ".review-gates/lenses",
+  "lenses": {
+    "repo-better-solution": {
+      "section": ".review-gates/lenses/repo-better-solution.md"
+    },
+    "repo-bug-prover": {
+      "section": ".review-gates/lenses/repo-bug-prover.md"
+    },
+    "repo-facts": {
+      "section": ".review-gates/lenses/repo-facts.md"
+    }
+  },
   "modes": {
     "commits": {
       "kind": "commits",