The attachment-policy fixtures introduced three assertions to unknown and
changed two previously recorded assertions. The new repository gate rejects
those escape hatches even though the earlier branch CI passed.
Give the user, tool-result, and inbox fixtures their required V4 message
metadata and declared identifier types. Declare the fixture's plugin content
tag through ContentBlockMap, and check the flat tool-result fixture directly
as its concrete SessionEvent type. Keep intentional malformed inbox entries
and opaque extension fields in the existing negative cases.
Remove all five unknown bridges without adding allowances. Delete the two
baseline entries retired by the rewritten existing fixtures; the other
three assertions were never part of the accepted baseline. Attachment
runtime code and the tests' access-denial and complete-log assertions remain
unchanged.
Validation: the Host TypeScript aggregate and all 52 archive tests pass.
verify-no-unknown-casts reports no new or stale entries, with 1575 existing
assertions remaining; the baseline adds zero allowances and retires two.
Tianyi Cui