docs(BOR-453/BOR-454): OpenDAL Swift + FSKit research and BOR-455 path

[bdclaw2026]

Summary

• add decision-ready research docs for BOR-453 (OpenDAL Swift binding)
• add decision-ready research docs for BOR-454 (FSKit integration model)
• add consolidated BOR-455 implementation path and risk checklist

Added Files

• docs/s3-mount-track/BOR-453-opendal-swift-binding.md
• docs/s3-mount-track/BOR-454-fskit.md
• docs/s3-mount-track/BOR-455-implementation-recommendation.md
• docs/s3-mount-track/README.md

Ticket

• BOR-453
• BOR-454

Status

• Draft: documentation baseline for implementation decisions

[bdclaw2026]

@codex @claude could you review this PR when you have a moment? Thanks!

[bdclaw2026]

@claude please review this PR

[bdclaw2026]

@codex please review this PR

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

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