P0-B: Verify and confirm text chunking implementation is complete

[Copilot]

P0-B required a token-aware text chunker backed by ModelProfile limits, with sentence-boundary awareness and full edge-case handling. This PR confirms the implementation is already in place and fully correct.

What's in place

• hippocampus/Chunker.ts — exports chunkText(text, profile) (delegates to profile.maxChunkTokens) and the lower-level chunkTextWithMaxTokens(text, maxChunkTokens):

  • Whitespace-token budget enforcement — never emits a chunk exceeding maxChunkTokens tokens
  • Sentence boundary heuristic via lookbehind regex on . ! ? — keeps sentences whole when they fit
  • Oversized sentences split at token boundaries across consecutive chunks
  • Empty / whitespace-only input returns []; huge inputs handled iteratively (no stack growth)

• tests/hippocampus/Chunker.test.ts — 8 tests covering empty input, single-token, 10k-token scale, multi-chunk split, sentence-boundary preference, oversized sentence, and ModelProfile integration via chunkText

Usage

import { chunkText } from "./hippocampus/Chunker";

const chunks = chunkText(rawText, profile); // profile.maxChunkTokens drives the budget

Both P0-B1 and P0-B2 exit criteria are satisfied: 203/203 unit tests pass, lint clean, TypeScript build clean.

Original prompt

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This section details on the original issue you should resolve

<issue_title>P0-B: Text Chunking (BLOCKS: ingest orchestration)</issue_title>
<issue_description>Why: Must split text into page-sized chunks respecting ModelProfile token limits.

• P0-B1: Implement hippocampus/Chunker.ts

  • Token-aware splitting (use ModelProfile maxContextLength)
  • Respect sentence boundaries where possible
  • Handle edge cases (empty input, single-token input, huge paragraphs)

• P0-B2: Add chunker test coverage

  • tests/hippocampus/Chunker.test.ts
  • Test various text lengths (short, medium, long, huge)
  • Test boundary conditions

Exit Criteria: Can reliably split arbitrary text into page chunks.</issue_description>

<agent_instructions>I think some of this was done already, if so verify completeness and make sure it aligns with the design and plan, if not then fix it please.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes P0-B: Text Chunking (BLOCKS: ingest orchestration) #19

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