A manifest-scoped compile that fails because a header isn't in the manifest
(an undeclared/transitive dependency) now retries once with scan-all, so a
project with an incomplete manifest still compiles instead of regressing.
The response reports manifest_incomplete=true and
manifest_suggested_libraries={header: [candidate lib names]} so the manifest
can be auto-completed (P2.4) or the user prompted to add the missing library.
This de-risks turning on manifest sending (P2.3): an incomplete example/project
manifest can never break a build that worked before.
- compile(): _attempt(allowed) helper; retry scan-all on missing-lib failure.
- _missing_library_headers / _suggest_libraries_for_headers helpers.
- CompileResponse.manifest_incomplete + manifest_suggested_libraries.
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