Add a live campaign showcase

[plmn95]

Outcome

• document custom campaign briefs without weakening the three goal policies
• add a fictional public source fixture and reviewed live Sonnet 5 campaign capture
• disable Sonnet 5 adaptive thinking for strict JSON responses
• recalibrate bounded provider deadlines from live evidence

Verification

• npm run check: 36 files, 278 tests passed
• npm run pack:check: passed
• npm audit --audit-level=high: 0 vulnerabilities
• live public-source generation: valid, 10 validation checks passed
• desktop and 390px mobile visual QA: passed

The temporary API credential is not present in the repository, commits, output record, or traces.