giles 9293366cb4 engine: boosted forms post text/sx, not urlencoded (SX-native write wire) ...

build-request-body's POST-form branch now serialises the form fields to a text/sx
body via the serialize primitive (content-type text/sx), instead of FormData ->
URLSearchParams -> urlencoded. A hydrated page posts SX; the host reads it via
host/sx-body / host/field (the server already accepts both — urlencoded stays the
no-engine / login-bootstrap fallback). Recompiled the web stack -> .sxbc.

Verified client-agnostically (no DOM, the user's preference): a new sxtp suite test
proves the wire contract serialize(engine) <-> host/sx-body(server) round-trips a
field dict losslessly, INCLUDING sx_content full of quotes/parens that would break a
naive encoder, plus host/field's content-type discrimination + urlencoded fallback
(sxtp 43/43). The DOM field-read (dom-query-all + .value) is the one irreducibly-
browser bit — left to a targeted Playwright smoke.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-30 11:14:21 +00:00

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