SubMiner/docs/subagents/agents/codex-narrow-space-tokenizer-20260220T061716Z-p97s.md

# Agent: `codex-narrow-space-tokenizer-20260220T061716Z-p97s`

- alias: `codex-narrow-space-tokenizer`
- mission: `Fix narrow/invisible subtitle spacing causing incorrect tokenizer boundaries.`
- status: `done`
- branch: `main`
- started_at: `2026-02-20T06:17:31Z`
- heartbeat_minutes: `5`

## Current Work (newest first)
- [2026-02-20T06:20:07Z] handoff: normalized invisible separators in tokenizer input; added regression test; targeted tests green.
- [2026-02-20T06:19:20Z] test: `bun run build && node --test dist/subtitle/stages/normalize.test.js` (pass, 1/1); `node --test dist/core/services/tokenizer.test.js` (pass, 43/43).
- [2026-02-20T06:18:38Z] edit: updated `normalizeTokenizerInput` to map `U+200B/U+2060/U+FEFF` to regular spaces before whitespace collapsing.
- [2026-02-20T06:18:02Z] test: added failing regression for subtitle sample with `\u200B` separator.
- [2026-02-20T06:17:31Z] intent: create TASK-90; TDD-first regression for narrow Unicode spacing in subtitle line `キリキリと かかってこい`.
- [2026-02-20T06:17:31Z] progress: coordination started; index row added; scanning tokenizer normalization points next.

## Files Touched
- `docs/subagents/INDEX.md`
- `docs/subagents/agents/codex-narrow-space-tokenizer-20260220T061716Z-p97s.md`
- `docs/subagents/collaboration.md`
- `backlog/tasks/task-90 - Normalize-narrow-Unicode-whitespace-in-tokenizer-input.md`
- `src/subtitle/stages/normalize.ts`
- `src/subtitle/stages/normalize.test.ts`

## Assumptions
- issue likely Unicode spacing code point treated as token boundary.
- target behavior: collapse/normalize narrow spacing to standard spacing before lookup token grouping.

## Open Questions / Blockers
- possible overlap with TASK-85 refactor touching tokenizer paths.

## Next Step
- done.