fix(cf-edit): reject add-childObject when object file is missing

cf-edit add-childObject was a low-level XML-manipulation operation
with no file-existence validation — callers could register a reference
to any Type.Name in Configuration.xml's ChildObjects without the
underlying file existing on disk. Platform then refused to load:
"Файл объекта не существует".

The 4 failing tests (add-objects, remove-object, add-default-role,
set-default-roles) all used this operation with fake references in
either main input or preRun, and had no way to pass verify-snapshots
because the cf-init-ed config had no actual object files.

User observation: this is the tests being wrong, not the skill.
meta-compile/role-compile/subsystem-compile already auto-register
every new object in Configuration.xml as part of their normal flow
(meta-compile.ps1:2949-3068, role-compile.ps1:667-747,
subsystem-compile.ps1:430-506). Nobody should be calling cf-edit
add-childObject to create a new object — they should be calling the
profile skill. cf-edit add-childObject is only for rare recovery
scenarios: rolled-back Configuration.xml with intact object files,
re-import from DB dump that clobbered the root but left srcfiles.

Changes:

1. cf-edit.ps1/py: Do-AddChildObject now checks that the target file
   exists at {ConfigDir}/{PluralDir}/{Name}.xml before registering.
   On miss, exits 1 with a message that names the expected path and
   points the user at the right skill (/meta-compile, /role-compile,
   or /subsystem-compile depending on type). TYPE_TO_DIR mapping for
   all 44 metadata types covers irregular plurals (FilterCriteria,
   BusinessProcesses, ChartsOfAccounts, ChartsOfCharacteristicTypes,
   ChartsOfCalculationTypes).

2. Tests: 4 existing cases rewritten to build realistic fixtures via
   meta-compile/role-compile preRun (both skills auto-register, so
   the resulting Configuration.xml already references the preRun
   objects). add-objects now exercises the round-trip recovery
   scenario: meta-compile creates Catalog.Товары and Document.ПриходТоваров
   (auto-registered) → cf-edit remove-childObject un-registers both
   (files remain) → main run re-registers via add-childObject. This
   tests exactly the rollback-recovery use case the operation exists for.

3. New add-missing-errors case: negative test with expectError:
   "Object file not found". Verifies the new hard-error path.

4. verify-snapshots.mjs: added symmetric expectError handling (runner.mjs
   already had it at line 514). If caseData.expectError is set,
   expect skill to fail; check stderr substring match; skip db-load
   and mark passed. Without this, negative tests would go red in
   verify-snapshots even though runner.mjs accepts them.

5. SKILL.md / reference.md: documented the new constraint and the
   redirection to profile skills. Kept mention of legitimate use case
   (rollback recovery).

Bumped cf-edit.ps1/py v1.0→v1.1.

Verification:
- runner --filter cf-edit (PS1): 2/6 → 7/7 (6 positive + 1 negative)
- runner --filter cf-edit --runtime python: 7/7 (dual-port clean)
- verify-snapshots --skill cf-edit: 2/6 → 7/7

With this landed P3 from debug/snapshot-verify/NEXT-STEPS.md is closed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/cf-edit/SKILL.md

@@ -32,7 +32,7 @@ powershell.exe -NoProfile -File .claude/skills/cf-edit/scripts/cf-edit.ps1 -Conf
 | Операция | Формат Value | Описание |
 |----------|-------------|----------|
 | `modify-property` | `Ключ=Значение` (batch `;;`) | Изменить свойство |
-| `add-childObject` | `Type.Name` (batch `;;`) | Добавить объект в ChildObjects |
+| `add-childObject` | `Type.Name` (batch `;;`) | Зарегистрировать уже существующий файл объекта в ChildObjects. Для создания нового объекта используй `/meta-compile`, `/role-compile`, `/subsystem-compile` — они регистрируют автоматически |
 | `remove-childObject` | `Type.Name` (batch `;;`) | Удалить объект из ChildObjects |
 | `add-defaultRole` | `Role.Name` или `Name` | Добавить роль по умолчанию |
 | `remove-defaultRole` | `Role.Name` или `Name` | Удалить роль по умолчанию |