Adds an eager provider for Amazon Quick Desktop (aws.amazon.com/quick/desktop),
which stores local data under ~/.quickwork. Usage source of truth is the
per-day EMF metrics JSONL (Model, InputTokens, OutputTokens, CostUSD,
session_id); real CostUSD passes through the cache like kiro/devin/hermes.
sessions.db (SQLite, read-only) enriches calls with titles, first user
message, and tool names, and provides estimated usage (quickdesk-auto,
costIsEstimated) for sessions that predate metrics coverage. Multi-profile
layout via profiles.json entries plus the migrated legacy root; honors
QUICKWORK_HOME; schema-tolerant (sqlite_master and PRAGMA introspection,
per-line JSONL error isolation). The on-disk schema is reverse-engineered and
documented as such in docs/providers/quickdesk.md.
