Add Phase 0 spike: end-to-end transport verified

Bare PHP behind FrankenPHP plus a Qt/QML host that spawns it. GET /api/ping
publishes a Mercure event; the QML window receives it back over the SSE
stream. Findings (Caddy directive ordering, Mercure transport scalar,
PR_SET_PDEATHSIG for child cleanup, PHP 8.5 curl_close deprecation, port
collision with system FrankenPHP, pure-QML SSE viability) are recorded in
spike/README.md so Phase 1 starts from a known-good baseline.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
2026-05-02 00:15:50 +02:00
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