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gsxdsm ef544597da FN-6665: group token analytics by runtime model

Record runtime model snapshots so token analytics group usage by the model that actually generated it.

- Add token-usage provider/model snapshot columns, store mapping, and migration support.
- Preserve actually-used session model metadata during executor/session token accumulation without changing task model overrides.
- Prefer runtime model snapshots in token provider/model aggregation and cover the behavior with regression tests and docs.

Files changed:
 .changeset/fn-6665-tokens-by-model.md              |  5 ++
 docs/dashboard-guide.md                            |  2 +-
 docs/storage.md                                    |  2 +
 .../core/src/__tests__/store-token-usage.test.ts   |  4 ++
 .../core/src/__tests__/token-analytics.test.ts     | 54 ++++++++++++++++++++-
 packages/core/src/db.ts                            | 12 ++++-
 packages/core/src/store.ts                         | 10 +++-
 packages/core/src/token-analytics.ts               | 12 ++++-
 packages/core/src/types.ts                         | 10 ++++
 .../src/__tests__/session-token-usage.test.ts      | 55 ++++++++++++++++++++--
 packages/engine/src/executor.ts                    | 37 +++++++++++++--
 packages/engine/src/session-token-usage.ts         |  7 +++
 12 files changed, 194 insertions(+), 16 deletions(-)

Fusion-Task-Id: FN-6665

Fusion-Task-Lineage: e103de14-6298-4a9e-93af-4dd15798fde5

2026-06-18 16:58:11 -07:00