chore: drop mupdf build tag in favor of build constraint (#161)

- use build constraints instead of mupdf build tag
- update go-fitz dependency
- drop unnecessary netgo build tag
- ensure build is working in wolfi base image

fix: delete-file adapt to ws://

change: drop default similarity threshold

fix (openai embedding): retry on transient stream error when reading …

…embeddings response (#157)

change: simpler way of handling metadata inserted by .knowledge.json (#…

…156)

fix (postgres/breaking): change postgres document content columns to …

…bytea to avoid encoding issue (#155)

change: by default, do not exit on a failing file ingestion, but make…

… sure we log the failed status (#154)

add: retrieval timin

chore: docs

change: use default concurrency of 100 for embeddings in pgvector (#153)