Meterleaf v0.15.0

feat(agy): show both Antigravity quota pools on one account (#65)

* docs(design): record visual tokens and conventions in DESIGN.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* feat(agy): show both Antigravity quota pools on one account

The collector now reports one account per Google login, with the Claude/GPT
pool on five-hour-3p and seven-day-3p windows. The legacy per-pool accounts are
sent with parentExternalId so their history resolves to the merged account.
The server must deploy before the collector because the ingest schema is strict.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore(release): prepare 0.15.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>