chore(storage): declare request_cancellation as implemented

[spydon]

Summary

`storage.file_buckets.request_cancellation` was marked `not_implemented` while `database.using_modifiers.request_cancellation` and `functions.invocation.request_cancellation` are declared `implemented` for the same mechanism: cancellation is plain Swift structured concurrency, there is no dedicated symbol to register.

Storage goes through the same path. `StorageHTTPSession` wraps the async `URLSession` data and upload calls, which honor Task cancellation, and the shared `RetryRequestInterceptor` checks `Task.isCancelled` after its backoff sleep. This flips the storage entry to `implemented` with the same note the other two modules carry.

Verification

A scratch executable pointed `SupabaseStorageClient` at a non-routable address with a 120 second URLSession timeout, started an `upload` and a `download` in their own Tasks, and cancelled both after 300 ms. Each threw `NSURLErrorDomain -999 "cancelled"` at roughly 320 ms instead of waiting out the timeout.

No test is added here. SDK-1640 tracks adding a mid-request and mid-backoff cancellation test for the shared transport, which covers storage as well.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 033b9994-d2e9-401a-b5c9-aa0b9578be26

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Reviewing files that changed from the base of the PR and between e4351ed and 628c29c.

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• sdk-compliance.yaml

💤 Files with no reviewable changes (1)

• sdk-compliance.yaml

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📝 Summary

Summary by CodeRabbit

• New Features
  • File bucket requests now support cancellation during in-progress transfers.
  • Cancelling the enclosing task stops the active transfer and retry process.

Walkthrough

The compliance manifest now marks storage.file_buckets.request_cancellation as implemented. A comment documents that cancellation uses Swift structured concurrency by cancelling the enclosing Task. It also states that URLSession terminates the in-flight transfer and the retry loop observes Task.isCancelled. No public declarations changed.

Priority: ⬇️ Low

Change: Other

Merge Risk: ⚪ Minimal · up to 628c2

The manifest-only capability status update has no identified merge-blocking risk.

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[coveralls]

Coverage Report for CI Build 34602536649

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage decreased (-0.2%) to 87.418%

Details

• Coverage decreased (-0.2%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 20 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

20 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
Sources/RealtimeV2/WebSocket/URLSessionWebSocket.swift	17	63.98%
Sources/Helpers/JSONValue/JSONValue.swift	3	97.35%

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Coverage Stats

Relevant Lines:	11032
Covered Lines:	9644
Line Coverage:	87.42%
Coverage Strength:	91.87 hits per line

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💛 - Coveralls

[github-actions]

⚠️ Capability matrix drift detected

The following capabilities are marked implemented in the matrix but could not be found in swift:

• client.session_management.persist_session → expected symbol: AuthLocalStorage.defaultLocalStorage
• functions.invocation.streaming_response → expected symbol: FunctionsClient._invokeWithStreamedResponse

The following capabilities are marked implemented in swift but have no registered symbols to verify:

• auth.passkey.register_passkey (no symbols list — cannot confirm implementation exists)
• auth.passkey.sign_in_with_passkey (no symbols list — cannot confirm implementation exists)
• client.observability.trace_propagation (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.request_cancellation (no symbols list — cannot confirm implementation exists)
• functions.invocation.request_cancellation (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.url_cache_nonce (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.request_cancellation (no symbols list — cannot confirm implementation exists)

These may have been renamed, removed, or never registered. Please update the capability matrix.
See: https://github.com/supabase/sdk/blob/main/packages/capability-matrix/docs/capability-matrix.md