feat(sub12a): add fp.step.template.transition.input

Transition-time prompts (fired when leaving a step). Authored now,
runtime-consumed in Sub 12b's Move Parts dialog. Carries a
compliance_tag selection (none/as9100/nadcap/cgp/nuclear) so audit
reports can filter by regulation regime.

input_type covers Steelhead's transition prompts: text, number,
boolean, selection, date, signature, photo, location_picker,
customer_wo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/models/fp_step_template_transition_input.py

@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+# Part of the Fusion Plating product family.
+
+from odoo import fields, models
+
+
+class FpStepTemplateTransitionInput(models.Model):
+    """Transition-time compliance field definition.
+
+    Fires when leaving a step (e.g. "Customer WO #", "Photo Evidence",
+    "Scrap Reason"). Authored on `fp.step.template`, snapshot-copied
+    onto `fusion.plating.process.node` when the library step is dragged
+    into a recipe. Sub 12b uses these to render the Move Parts dialog.
+    """
+    _name = 'fp.step.template.transition.input'
+    _description = 'Fusion Plating — Step Template Transition Input'
+    _order = 'sequence, name'
+
+    name = fields.Char(string='Name', required=True, translate=True)
+    template_id = fields.Many2one(
+        'fp.step.template', string='Template',
+        required=True, ondelete='cascade', index=True,
+    )
+    input_type = fields.Selection([
+        ('text', 'Text'),
+        ('number', 'Number'),
+        ('boolean', 'Yes/No'),
+        ('selection', 'Selection'),
+        ('date', 'Date / Time'),
+        ('signature', 'Signature'),
+        ('photo', 'Photo'),
+        ('location_picker', 'Location Picker'),
+        ('customer_wo', 'Customer WO #'),
+    ], string='Input Type', required=True, default='text')
+    required = fields.Boolean(string='Required', default=False,
+        help='If True, the move is hard-blocked while this input is blank.')
+    hint = fields.Char(string='Hint')
+    selection_options = fields.Text(string='Selection Options',
+        help='Comma-separated when input_type is "selection".')
+    sequence = fields.Integer(string='Sequence', default=10)
+    compliance_tag = fields.Selection([
+        ('none', 'None'),
+        ('as9100', 'AS9100'),
+        ('nadcap', 'Nadcap'),
+        ('cgp', 'Controlled Goods'),
+        ('nuclear', 'Nuclear'),
+    ], string='Compliance Tag', default='none',
+        help='Drives audit-report inclusion / filtering.')