chore(main): release 0.38.0

[release-please]

🤖 I have created a release beep boop

0.38.0 (2026-08-17)

Features

• internal/librarian/nodejs: use protoc version from librarian.yaml (#7249) (2c9470c)
• internal/librarian/python: use protoc version from librarian.yaml (#7248) (7dcde79)
• internal/sidekick/rust: make request on BidiStreamBuilder optional (#7264) (2b06192), refs #6835
• internal/sidekick/rust: support BidiStreamOptions for bidi streaming (#7246) (3c30001), refs #6835
• internal/sidekick/rust: support request headers for bidi streaming (#7273) (f8beaf0), refs #6835
• internal/sidekick/rust: wrap stream closed errors in BrokenPipe io error (#7291) (27c21e3), refs #6835
• internal/tool/protoc: add BinaryPath and BinaryPathOrSystem helpers (#7247) (819e8c8)
• librarian: install tools for Swift (#7296) (60c3bb6)
• librarian: support SHA256-by-OS for protoc (#7283) (2dc70ba)
• sidekick/rust: derive Debug for generated types (#7258) (4fab542)
• sidekick/rust: skip convert for Any fields (#7292) (54acc44)
• sidekick: install protoc via librarian (#7286) (ac64c4c)
• sidekick: support fields in skipped_ids (#7295) (85d1716)
• swift: support gRPC transport template (#7245) (681ad71)
• swift: support included_ids in package and module configuration (#7274) (b79332c)

Bug Fixes

• .github: install protoc in rust integration (#7290) (231308c), refs #7289
• sidekick/rust: discovery LROs and features (#7275) (cecd47a)
• sidekick/rust: lints in generated code (#7299) (01e160e)
• sidekick/swift: mangling for `Type (#7267) (fa21f5b)
• swift: support included_ids in package and module configuration (#7294) (e70eda5)
• tool/cmd/migrate/php: programmatically set explicit Output during PHP migration (#7268) (3766f3f), refs #7262

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