get2knowio / deacon / 18767409331
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feat(features-plan): Parallelize OCI metadata fetch with bounded concurrency (#381)

* Initial plan

* Implement parallel OCI metadata fetch with bounded concurrency

- Add futures dependency for parallel stream processing
- Replace serial fetch loop with parallel implementation using futures::stream
- Use buffer_unordered(N) with configurable concurrency limit (default 6)
- Ensure deterministic ordering by collecting into BTreeMap
- Add DEACON_FETCH_CONCURRENCY environment variable for user control
- Clamp concurrency between 1-32 to prevent resource exhaustion
- Add unit tests for concurrency configuration
- All existing tests pass, maintaining backward compatibility

Co-authored-by: pofallon <505519+pofallon@users.noreply.github.com>

* Fix test isolation: refactor concurrency tests to avoid global state

Extract parsing logic into get_fetch_concurrency_impl that takes
Option<&str> parameter, eliminating need for tests to mutate global
DEACON_FETCH_CONCURRENCY environment variable. This prevents test
interference when running in parallel.

- Add get_fetch_concurrency_impl(env_value: Option<&str>) -> usize
- Keep get_fetch_concurrency() as thin wrapper reading from env
- Update all 4 tests to call _impl directly with string literals
- Tests now pure functions without global state mutation
- Maintains identical parsing, default (6), and clamping (1..32) behavior

Co-authored-by: pofallon <505519+pofallon@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pofallon <505519+pofallon@users.noreply.github.com>

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