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194ceb64f5 feat(desktop): add harness to NIP-AM agent-usage breakdown (#2790 )

Stack: #2035 → this PR

## What

Group the per-agent model breakdown by `(harness, model)` instead of
`model` alone, so the same model running under two different harnesses
(e.g. `claude-sonnet` via `goose` vs `claude-code`) produces two
distinct rows rather than collapsing into one.

## Changes

**Rust / SQLite**
- `agent_metric_index`: add nullable `harness TEXT` column. Schema
migration M1: `ALTER TABLE ... ADD COLUMN` + delete-then-backfill
rebuild so all existing rows get `harness` populated from retained
`archived_events.raw_json` — no data loss; ingest and backfill share the
same `from_payload` parser (frozen-plan requirement preserved).
- `AgentMetricIndexRow`: parse `harness` from
`AgentTurnMetricPayload.harness` (REQUIRED field per NIP-AM), write/read
through all store paths (`ROW_COLUMNS`, INSERT, `row_from_sql`).
- `AgentScope.models` grouping key widened from `Option<String>` to
`(Option<String>, Option<String>)` i.e. `(harness, model)`. Sort
tiebreak: harness ascending → model ascending, `None` last in each.
- `ModelUsage` wire type: add `harness: Option<String>` field.

**Frontend**
- `tauriArchive.ts` / `bridge.ts`: add `harness` to `AgentUsageModel`
type.
- `AgentUsageFocusedView`: render `harness` as a dimmed sub-label next
to each model name on breakdown rows. `null` harness (pre-migration data
or unknown) renders no label — single-harness data is visually
unchanged.
- `agentUsage.ts` `sortModelsByKnownTotal`: tiebreak updated for
compound `(harness, model)` key.

**Tests**
- Rust: collapse-fix test (same model / two harnesses → two rows),
migration test (old-shape rows get harness populated after rebuild),
harness sort coverage.
- TS: `sortModelsByKnownTotal` harness tiebreak tests, same-model
two-harness sort test.
- E2E: `bridge.ts` fixture type updated, `agent-usage.spec.ts` harness
assertion, `agent-usage-screenshots.spec.ts` shot 02 harness-label
visibility check.

## Gates

All green locally:
- `just desktop-check` ✓
- `just desktop-typecheck` ✓
- `just desktop-build` ✓
- `just desktop-test` (3487 pass, 0 fail) ✓
- `cargo test` in `desktop/src-tauri` (1575 pass, 0 fail) ✓

---------

Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1mn7jgtj4w2pd0g0zeuhxsa6jy6p0rewxz4kujt98my82ahfmp72sxjexk7 <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>

2026-07-25 12:04:11 -04:00