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Add BunPress guide and pre-E2E quality gates

Merged glennmichael123 wants to merge docs/bunpress-product-guide into main

318 files +2174 -70006

25fe980151 docs: replace framework manual with CommsHQ guide glennmichael123 review this step
d56c8dbb53 ci: validate application and documentation builds glennmichael123 review this step
47298bdfa1 test: cover automation and webhook flows glennmichael123 review this step
b1fd649abb test: add deterministic product state fixtures glennmichael123 review this step
2afc7ac094 test: add static accessibility contracts glennmichael123 review this step
c078840d78 test(ui): add responsive visual contracts glennmichael123 review this step
3bd7745e7a ci: harden production release validation glennmichael123 review this step
8d3e56e65b fix(test): match registered marketing layout glennmichael123 review this step
cf25c90a1b fix(consent): make public transitions idempotent glennmichael123 review this step
3cb6194923 docs: clarify safe owner bootstrap glennmichael123 review this step
0ef89f13e1 fix(ui): repair responsive workspace contrast glennmichael123 review this step