feat(fusion_accounting_bank_rec): inherit account.bank.statement.line + account.reconcile.model

Task 17 — Add Phase 1 widget compute fields and AI hooks:
- account.bank.statement.line: fusion_top_suggestion_id (m2o, unstored),
  fusion_confidence_band (selection, unstored), bank_statement_attachment_ids
  (one2many compute, mirrors Enterprise's surface field for the OWL widget).
- account.reconcile.model: fusion_ai_confidence_threshold (float).
- Bumps manifest 19.0.1.0.3 → 19.0.1.0.4.

V19 note: dropped @api.depends('id') on _compute_top_suggestion (NotImplementedError
in V19); compute is on-demand for unstored field anyway.

Made-with: Cursor

fusion_accounting_bank_rec/models/account_reconcile_model.py

@@ -0,0 +1,20 @@
+"""Inherit account.reconcile.model to add Phase 1 AI integration hooks.
+
+This is a minimal extension placeholder for now — Phase 1+ phases may
+expand it (e.g., to attach AI confidence rules to reconcile-model
+auto-fires). The shared-field-ownership for `created_automatically`
+already lives in fusion_accounting_core; this file is for fusion_bank_rec
+specific extensions only.
+"""
+
+from odoo import fields, models
+
+
+class AccountReconcileModel(models.Model):
+    _inherit = "account.reconcile.model"
+
+    fusion_ai_confidence_threshold = fields.Float(
+        string="AI confidence threshold",
+        default=0.0,
+        help="If >0.0, fusion AI suggestions matching this rule are auto-applied "
+             "only when their confidence ≥ this threshold. 0.0 = no AI filtering.")