* fix(bundler): reject falsy non-mapping requires/provides in manifest from_dict
BundleManifest.from_dict used `data.get("requires") or {}` and
`data.get("provides") or {}`, so a FALSY non-mapping value ([], '', 0,
false) was coerced to {} BEFORE the isinstance guard — a malformed manifest
passed validation as one that requires/provides nothing. Only a truthy
non-mapping (e.g. "extensions") was rejected.
Handle None explicitly (default to {}) and reject every other non-mapping,
matching the sibling 'integration' guard added in #3629. Absent fields still
parse to the empty default.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* test(bundler): correct absent-optional-mapping regression assertion
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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