Adds POST /api/v1/chunker/preview — a read-only endpoint that runs the
adaptive chunker on supplied text and returns the chunks plus
diagnostic info (which tier won, which were rejected and why, the
DocProfile that the selector saw). Used by the upcoming KB editor
debug panel so users can experiment with chunking parameters without
re-uploading documents.
Backend pieces:
- chunker.SplitWithDiagnostics(text, cfg) returns chunks plus a
Diagnostics struct (SelectedTier, TierChain, Rejected). Split() now
delegates here.
- chunker.DocProfile gets JSON tags so it serializes cleanly.
- handler.PreviewChunking caps input at 256k chars and chunks at 500
per response, computes a size-distribution summary, and never
touches DB or embedding APIs.
Auth: lives under the v1 group so the standard JWT middleware applies.
https://claude.ai/code/session_01XADhx6mtu2ZYW3DE9Lun6k
Claude
a867b1b29d