⬆️ version bump to v4.5

- Update obioptions.Version from "Release 4.4.29" to "/v/ Release v5"
- Update version.txt from 4.29 → .30
(automated by Makefile)

autodoc/docmd/pkg/obiutils/pipe.md

@@ -0,0 +1,36 @@
+# `obiutils` Package: Pipe Synchronization Utilities
+
+This Go package provides lightweight synchronization primitives for managing concurrent pipeline execution, particularly useful in CLI or batch-processing applications.
+
+## Core Components
+
+- **`globalLocker`:** A `sync.WaitGroup` tracking active pipeline goroutines.
+- **`globalLockerCounter`:** An integer counter for logging/debugging the number of active pipes.
+
+## Public Functions
+
+### `RegisterAPipe()`
+- Increments both the WaitGroup and counter.
+- Logs current count at debug level (`log.Debugln`).
+- Typically called when starting a new pipeline stage or goroutine.
+
+### `UnregisterPipe()`
+- Decrements the WaitGroup and counter.
+- Logs updated count at debug level.
+- Should be invoked when a pipeline finishes (e.g., `defer UnregisterPipe()`).
+
+### `WaitForLastPipe()`
+- Blocks until all registered pipes complete (`globalLocker.Wait()`).
+- Intended to be called at the end of `main()`, ensuring graceful shutdown.
+
+## Semantic Use Case
+
+Enables safe, concurrent execution of multiple independent pipelines (e.g., data processing stages), ensuring the program waits for all to finish before exiting — without explicit channel or mutex management.
+
+## Design Notes
+
+- **Thread-safe** via `sync.WaitGroup`.
+- **Minimalist**: No error handling; assumes correct usage.
+- **Logging-focused** for observability in development/debug builds.
+
+> ⚠️ Not production-ready without additional safeguards (e.g., panic recovery, timeout support).