Alan-Jowett / LexonGraph / 26992545598

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Add indexer clustering progress callbacks and optional parallel DCBC (#48)

* Add indexer clustering progress callbacks and optional parallel DCBC

Add caller-supplied indexing status observers with periodic clustering heartbeats, add observer-capable staged parent construction, and introduce feature-gated parallel DCBC distance computation while preserving deterministic outputs and explicit failure behavior.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Handle observer panics in status callbacks

Catch panics from caller-supplied indexing status observers so optional progress reporting remains non-fatal, and add regression coverage for panic-safe observer delivery.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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