openspec: scan-flow change — proposal, design, 5 specs (3 new + 2 deltas), tasks

openspec/changes/scan-flow/specs/finder-contact/spec.md

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+## ADDED Requirements
+
+### Requirement: Finder contact form
+The active tag page SHALL provide an input for the finder to leave their mobile number. Submitting SHALL store the number on the latest scan (`scans.scanner_phone`) and notify the owner by SMS with the finder's number.
+
+#### Scenario: Finder leaves a number
+- **WHEN** the finder submits a valid mobile number
+- **THEN** the number is stored in `scans.scanner_phone` and the owner receives an SMS containing it
+
+#### Scenario: Invalid input
+- **WHEN** the finder submits an empty or malformed number
+- **THEN** an inline error is shown and nothing is stored