[I] feat: add conditional writes and Sync integration for Direct volumes [opendal-yinyang]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new issue, #77:
URL: https://github.com/apache/opendal-yinyang/issues/77

   Implementation roadmap: #67. Dependencies: #76, #72, #73. See Scope for sequencing versus completion gates.
   
   ## Problem
   
   Direct writable access and local replicas are absent. These must preserve storage-native interoperability without pretending that object APIs provide Managed transactions or stable identity across rename.
   
   ## Scope
   
   Stage whole-object replacements and publish conditionally using supported versions/ETags. Expose writable Mount and Direct Sync only for combinations whose semantics can be enforced. Conditional Mount writes can proceed after read-only Direct; Sync additionally needs the replica and status work.
   
   ## Acceptance criteria
   
   - [ ] Detect conflicting external replacements and retain local bytes; keep writable admission disabled when conditional replacement is unavailable.
   - [ ] Specify rename/copy/delete partial failure and retry behavior without claiming cross-object atomicity or Managed receipts.
   - [ ] Discover remote changes for Direct Sync through listing/version observations and reconcile against an explicit local baseline.
   - [ ] Cover response uncertainty, restart and newer local edits without blindly overwriting or falsely acknowledging completion.
   - [ ] Validate supported Direct Mount and Sync combinations independently and document their differences from Managed.
   
   ## Planning
   
   Milestone: M3. Primary direction: Direct / Mount and Sync. Architecture index: #19.
   
   ## Baseline
   
   [Current contract](https://github.com/apache/opendal-yinyang/blob/1146781a127a7fa3ad2afee3e3ca8c823d659013/specs/volume-capabilities.md) at main `1146781`, verified 2026-10-26. Existing native observations describe the documented prototype; this issue does not claim new acceptance results.
   
   


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Re: [I] feat: add conditional writes and Sync integration for Direct volumes [opendal-yinyang]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo closed issue #77: feat: add conditional writes and Sync integration for Direct volumes
URL: https://github.com/apache/opendal-yinyang/issues/77


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