retrofit: reverse-spec case-location (2 REQs / 1 file)

[rubenvdlinde]

Retrofit — Reverse-Spec

Describes observed behavior of LocationService::validate() + attachToCase() as 2 new REQs (REQ-LOC-05, REQ-LOC-06) on the case-location capability.

Ghost change: `retrofit-2026-05-25-case-location` (archived in same PR).

What this PR does

• Drafts 2 REQs: `retrofit_extensions: [REQ-LOC-05, REQ-LOC-06]`
• Annotates LocationService
• Merges spec delta into `openspec/specs/case-location/spec.md`

Review focus

• REQ-LOC-05 codifies the per-source rule matrix in code as an observable contract
• REQ-LOC-06 Notes flag the "Throwable -> null" save pattern as observed-but-worth-noting

Source: `openspec/coverage-report.md` generated 2026-05-24 | Cluster: `case-location` | Refs #565

[github-actions]

Quality Report — ConductionNL/procest @ 661d325

Check	PHP	Vue	Security	License	Tests
lint	❌
phpcs	❌
phpmd	❌
psalm	❌
phpstan	❌
phpmetrics	❌
eslint		✅
stylelint		✅
composer			❌	❌
npm			✅	✅ 426/426
PHPUnit					⏭️
Newman					⏭️
Playwright					⏭️

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Quality workflow — 2026-05-24 22:20 UTC

Download the full PDF report from the workflow artifacts.