openspec: sms-metering-location-link change

openspec/changes/sms-metering-location-link/specs/location-link/spec.md

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+## ADDED Requirements
+
+### Requirement: Short URL per alert
+When an alert SMS is sent with a location, a short code SHALL be created mapping to the scan, and the SMS SHALL contain `https://where-woof.com/s/{code}` as the location link.
+
+#### Scenario: Alert with location
+- **WHEN** an alert is sent for a scan with coordinates
+- **THEN** a short code exists for the scan and the SMS links to it
+
+### Requirement: Location page
+`GET /s/{code}` SHALL render the owner's location page: embedded map of the scan's coordinates, the finder's phone if provided, a link to the tag page, and the scan time.
+
+#### Scenario: Owner opens the link
+- **WHEN** the owner opens a valid short link
+- **THEN** the map and finder details are shown
+
+#### Scenario: Unknown code
+- **WHEN** the code does not exist
+- **THEN** a not-found response is returned