* Exponential backoff delay for retryable errors (429, 5xx). * Returns delay in ms: min(2^attempt * 500, MAX_BACKOFF_MS) + jitter.

Apply book-level filters (--book-id, --source, --category).

* Strip env vars that would make a child `claude` CLI think it's nested. * Only used for the `claude-cli` provider.

Convert --focus argument to a prompt instruction. Accepts a preset name (tech, strategy, personal, creative) or free-text description. Return

Build the `thoughts` row for a single highlight.

Check if a semantically similar thought already exists. Uses the match_thoughts RPC with a high similarity threshold. Returns True if a near-

* Telegram text messages cap at 4096 chars. If the digest goes over, split * cleanly: prefer a paragraph break (double newline), then a single newlin

Split note body on ## headings. Returns list of {section, content}.

Chunk a parsed note into atomic thoughts. Returns list of dicts: {content, section, was_llm_chunked}

Atomically claim pending items — returns only items this worker actually acquired.