feat(fusion_accounting_bank_rec): pattern + precedent models for behavioural learning

Adds the foundation for AI confidence scoring:
- fusion.reconcile.pattern: per-(company, partner) aggregate profile
  (volume, cadence, preferred matching strategy, memo signature,
  write-off habits) — recomputed nightly from precedents.
- fusion.reconcile.precedent: per-historical-decision memory holding
  full feature vector + outcome, used by precedent_lookup for KNN
  scoring of new bank lines.

Includes ACL rows for fusion accounting user (read) and admin (CRUD)
groups. Manifest bumped to 19.0.1.0.1.

Note: switched the pattern uniqueness rule from the deprecated
_sql_constraints attribute to models.Constraint (Odoo 19 native API)
so the unique(company_id, partner_id) is actually enforced at the
PG level — _sql_constraints is silently ignored in 19.

Made-with: Cursor

fusion_accounting_bank_rec/models/__init__.py

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+from . import fusion_reconcile_pattern
+from . import fusion_reconcile_precedent

fusion_accounting_bank_rec/models/fusion_reconcile_pattern.py

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+"""Per-partner bank reconciliation pattern aggregate.
+
+One row per (company_id, partner_id). Continuously summarises HOW this
+partner gets reconciled. Recomputed nightly via cron from the precedent
+table. Used as a feature input to confidence_scoring.
+"""
+
+from odoo import fields, models
+
+
+class FusionReconcilePattern(models.Model):
+    _name = "fusion.reconcile.pattern"
+    _description = "Per-partner bank reconciliation pattern aggregate"
+    _rec_name = "partner_id"
+
+    company_id = fields.Many2one('res.company', required=True, index=True,
+                                   default=lambda self: self.env.company)
+    partner_id = fields.Many2one('res.partner', required=True, index=True)
+
+    # Volume + cadence
+    reconcile_count = fields.Integer(default=0,
+        help="Total past reconciles for this partner")
+    typical_amount_range = fields.Char(
+        help="e.g. '$1,200 – $2,400 (median $1,847.50)'")
+    typical_cadence_days = fields.Float(
+        help="Mean inter-reconcile days")
+    typical_day_of_month = fields.Char(
+        help="e.g. '1st, 15th'")
+
+    # Matching strategy used historically
+    pref_strategy = fields.Selection([
+        ('exact_amount', 'Exact-amount-first'),
+        ('fifo', 'FIFO oldest-due-first'),
+        ('multi_invoice', 'Multi-invoice consolidation'),
+        ('cherry_pick', 'Cherry-pick specific invoices'),
+    ])
+    pref_account_id = fields.Many2one('account.account',
+        help="Most-used target account")
+
+    # Memo signature
+    common_memo_tokens = fields.Char(
+        help="Comma-separated tokens that appear in ≥30% of past reconciles")
+
+    # Tax + write-off habits
+    common_writeoff_account_id = fields.Many2one('account.account')
+    common_writeoff_tax_id = fields.Many2one('account.tax')
+    typical_writeoff_amount = fields.Float(
+        help="e.g. 0.05 for rounding diffs")
+
+    last_refreshed_at = fields.Datetime()
+
+    _uniq_company_partner = models.Constraint(
+        'unique(company_id, partner_id)',
+        'One pattern row per (company, partner) — already exists.',
+    )

fusion_accounting_bank_rec/models/fusion_reconcile_precedent.py

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+"""Per-historical-decision reconciliation memory.
+
+One row per past reconciliation. Holds the full feature vector + outcome,
+used by precedent_lookup for K-nearest-neighbour search when scoring a
+new bank line.
+"""
+
+from odoo import fields, models
+
+
+class FusionReconcilePrecedent(models.Model):
+    _name = "fusion.reconcile.precedent"
+    _description = "Historical bank reconciliation decision (memory)"
+    _order = "reconciled_at desc, id desc"
+
+    company_id = fields.Many2one('res.company', required=True, index=True,
+                                   default=lambda self: self.env.company)
+    partner_id = fields.Many2one('res.partner', index=True)
+
+    # Bank line features (the "input")
+    amount = fields.Monetary(currency_field='currency_id')
+    currency_id = fields.Many2one('res.currency')
+    date = fields.Date()
+    memo_tokens = fields.Char(
+        help="Comma-separated normalized memo tokens (output of memo_tokenizer)")
+    journal_id = fields.Many2one('account.journal')
+
+    # Outcome (the "decision made")
+    matched_move_line_count = fields.Integer(
+        help="1 = exact, 2-3 = consolidation, etc.")
+    matched_account_ids = fields.Char(
+        help="Comma-separated account.account IDs that were matched against")
+    matched_invoice_ages_days = fields.Char(
+        help="Comma-separated days-old at reconcile time, e.g. '12, 45, 78'")
+    write_off_amount = fields.Float()
+    write_off_account_id = fields.Many2one('account.account')
+    exchange_diff = fields.Boolean()
+
+    # Provenance
+    reconciler_user_id = fields.Many2one('res.users')
+    reconciled_at = fields.Datetime()
+    source = fields.Selection([
+        ('historical_bootstrap', 'Imported from history'),
+        ('manual', 'Manual reconcile via fusion'),
+        ('ai_accepted', 'AI suggestion accepted'),
+        ('auto_rule', 'account.reconcile.model auto-fired'),
+    ], required=True)
+
+    # No uniqueness constraint — multiple reconciles can share features