fed-sx-m2: Step 2a — Person/Service/Group genesis object-types

Three new DefineObject artefacts in next/genesis/object-types/ for
the canonical actor object-types per design §9.1:

- Person: human-controlled identity (display name + handle + bio)
- Service: automated / programmatic actor (bot, feed, organisation)
- Group: multi-controller actor (member-set managed via Add/Remove)

Each is a small SX form with :name / :doc / :schema, identical
shape to existing object-types (note.sx, sx-artifact.sx etc) so the
existing bootstrap:populate_registry walk picks them up without
code changes. Manifest extended (object-types: 10 -> 13, total
entries: 31 -> 34).

Tests:
- genesis_parse.sh +7 cases (head form, :name, manifest membership);
  57/57.
- Hardcoded counts bumped in bootstrap_read.sh, bootstrap_load.sh,
  bootstrap_populate.sh, bootstrap_start.sh.
- bootstrap_build.sh 12/12 (bundle CID computed dynamically).

Conformance 761/761 preserved. 211/211 across 12 Step-2-adjacent
suites.

next/tests/genesis_parse.sh

@@ -64,6 +64,20 @@ cat > "$TMPFILE" <<'EPOCHS'
 (eval "(get (apply dict (rest (parse (file-read \"next/genesis/object-types/define-sig-suite.sx\")))) :name)")
 (epoch 40)
 (eval "(get (apply dict (rest (parse (file-read \"next/genesis/object-types/snapshot.sx\")))) :name)")
+(epoch 42)
+(eval "(first (parse (file-read \"next/genesis/object-types/person.sx\")))")
+(epoch 43)
+(eval "(get (apply dict (rest (parse (file-read \"next/genesis/object-types/person.sx\")))) :name)")
+(epoch 44)
+(eval "(first (parse (file-read \"next/genesis/object-types/service.sx\")))")
+(epoch 45)
+(eval "(get (apply dict (rest (parse (file-read \"next/genesis/object-types/service.sx\")))) :name)")
+(epoch 46)
+(eval "(first (parse (file-read \"next/genesis/object-types/group.sx\")))")
+(epoch 47)
+(eval "(get (apply dict (rest (parse (file-read \"next/genesis/object-types/group.sx\")))) :name)")
+(epoch 48)
+(eval "(some (fn (p) (= p \"object-types/person.sx\")) (get (apply dict (rest (parse (file-read \"next/genesis/manifest.sx\")))) :object-types))")
 (epoch 41)
 (eval "(len (get (apply dict (rest (parse (file-read \"next/genesis/manifest.sx\")))) :object-types))")
 (epoch 50)
@@ -166,7 +180,14 @@ check 37 "define-validator.sx name"     "DefineValidator"
 check 38 "define-codec.sx name"         "DefineCodec"
 check 39 "define-sig-suite.sx name"     "DefineSigSuite"
 check 40 "snapshot.sx name"             "Snapshot"
-check 41 "manifest has 10 object-types" "10"
+check 42 "person.sx head form"          "DefineObject"
+check 43 "person.sx name"               "Person"
+check 44 "service.sx head form"         "DefineObject"
+check 45 "service.sx name"              "Service"
+check 46 "group.sx head form"           "DefineObject"
+check 47 "group.sx name"                "Group"
+check 48 "manifest lists person.sx"     "true"
+check 41 "manifest has 13 object-types" "13"
 check 50 "activity-log.sx head form"    "DefineProjection"
 check 51 "activity-log.sx name"         "activity-log"
 check 52 "by-type.sx name"              "by-type"