docs(fusion_accounting_bank_rec): CLAUDE.md, UPGRADE_NOTES.md, README.md

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fusion_accounting_bank_rec/UPGRADE_NOTES.md

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+# fusion_accounting_bank_rec — Upgrade Notes
+
+## Odoo Version Anchor
+
+This module targets **Odoo 19.0** (community-base).
+
+Reference snapshot of Enterprise code mirrored from:
+- `account_accountant` (Odoo 19.0.x)
+- Source: `/Users/gurpreet/Github/RePackaged-Odoo/accounting/account_accountant/`
+
+## Cross-Version Diff Strategy
+
+When a new Odoo version ships:
+
+1. Run `check_odoo_diff.sh` (in repo root) against the new Enterprise version
+2. Note any breaking changes in `account.bank.statement.line` API
+3. For mirrored OWL components, diff Enterprise's new versions against ours and
+   port material changes (signature renames, new behaviour we want to inherit)
+4. Re-run the full test suite + tour tests against the new Odoo version
+5. Update this file with the new version anchor + any deviations
+
+## V19 Migration Notes (already applied)
+
+- `_sql_constraints` → `models.Constraint` (Tasks 14, 15)
+- `@api.depends('id')` → removed (Task 17)
+- `@route(type='json')` → `type='jsonrpc'` (Task 26)
+- `numbercall` removed from `ir.cron` (Task 25)
+- `res.groups.users` → `user_ids` (Task 43)
+- `ir.ui.menu.groups_id` → `group_ids` (Tasks 42, 43)
+
+## Phase 1 → Phase 1.5 Migration
+
+If we ship Phase 1.5 (UI polish, deferred features), changes will go in
+incremental commits. No DB migration needed (Phase 1 schema is forward-compatible).