[PR] feat(core): add checked namespace edits [opendal-yinyang]

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

Xuanwo opened a new pull request, #45:
URL: https://github.com/apache/opendal-yinyang/pull/45

   # Which issue does this PR close?
   
   Part of #19. Stack 2/3, based on #44. The next layer publishes and restores local directories.
   
   # Rationale for this change
   
   Callers currently construct complete successor trees and manually maintain node and directory generations. That spreads namespace correctness into every frontend.
   
   # What changes are included in this PR?
   
   `Observation::edit` stages checked creation, file replacement, executable attributes, subtree rename, and removal. `finish` computes generations relative to the observed state, so repeated changes in one batch advance a generation only once and reverted changes preserve it. A parent-identity name index enforces portable case-folding rules without rescanning the whole namespace for each creation.
   
   # Are there any user-facing changes?
   
   The core now provides a namespace-editing API. Rename preserves subtree identities and refuses to overwrite another entry; removal of non-empty directories is explicit. Failed operations leave the batch unchanged. Publication still uses the original observation and caller-assigned commit identity, returning conflicts without automatic rebasing. Unlinked immutable content remains readable.
   


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Re: [PR] feat: publish indexed filesystem transactions [opendal-yinyang]

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

Xuanwo merged PR #45:
URL: https://github.com/apache/opendal-yinyang/pull/45


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