Rename token types and centralize space-aware token joining

token-join-summary.md

Rename token types and centralize space-aware token joining

Commit: https://github.com/hosmada/emr/commit/2c27eb5381d082e0a9745085d384b8fbe74e83e6

What changed:

• Renamed two Token#token_type values for clarity: word → japanese_word and foreign → latin_word.
• Added SuikaTokenizer.join(tokens), a shared helper that reconstructs text from tokens correctly instead of naively joining with a fixed separator. It only inserts a space between two consecutive "space-delimited" tokens (Latin words, abbreviations, and numbers) — Japanese tokens never get a space.
• Wired Meeting#utterances and ReviewWorkflow#phi_review_data to use this new helper instead of tokens.map(&:text).join(" ").
• Updated the token test factory to auto-classify token_type from text via the real tokenizer instead of hardcoding a default.

Why: Our transcripts are Japanese, and the old .join(" ") inserted a literal space between every token regardless of script. That's correct for English but wrong for Japanese (no inter-word spaces) and also silently dropped real spacing in things like "2026 01 02" (which collapsed to "20260102"). The new logic gets both cases right, while leaving punctuation-delimited text like "2026-01-02" untouched.

Examples (before → after):

Tokens	Old .join(" ")	New SuikaTokenizer.join
今回, は (Japanese)	"今回 は" ❌	"今回は" ✅
MRI (abbrev), 検査 (Japanese)	"MRI 検査" ❌	"MRI検査" ✅
Hello, there (Latin)	"Hello there" ✅	"Hello there" ✅ (unchanged)
2026, 01, 02 (numbers)	"2026 01 02" ✅ (accidentally)	"2026 01 02" ✅ (correctly, by rule)
2026, -, 01 (number/punctuation)	"2026 - 01" ❌	"2026-01" ✅

Risk/impact: Existing PHI/review text derived from tokens will now render with more accurate spacing.