feat(command): projection subset for findOneAndUpdate/findOneAndReplace

[midagedev]

Summary

• add projection subset support for findOneAndUpdate and findOneAndReplace
• pass projection through wrappers into findAndModify path (fields)
• implement projection handling in FindAndModifyCommandHandler for returned value
• support include/exclude subset with _id override
• reject mixed include/exclude projection (except _id)
• add command E2E coverage for include/exclude nested path behavior and invalid mixed projection
• update compatibility docs

Review Findings

• no blocking defects found in maintainer review
• known gap: projection path handling is document-focused and does not attempt full array projection parity

Verification

• /Users/hckim/.local/gradle-8.10.2/bin/gradle --no-daemon test --tests "org.jongodb.command.CommandDispatcherE2ETest"
• /Users/hckim/.local/gradle-8.10.2/bin/gradle --no-daemon test --tests "org.jongodb.command.*"

Closes #85

[midagedev]

Maintainer review checklist:\n1) bug-risk findings: no blocking defects found\n2) missing test gaps: array-focused projection parity remains partial\n3) post-review fixes: added mixed projection rejection + nested include/exclude tests\n4) verification rerun: CommandDispatcherE2ETest and command suite passed