Gateway status dimensions in collector span metrics; agentsview full session content - #848

## Scope

Add per-lane tool/API rates, separate estimated Claude/Codex costs, and gateway provider/model/outcome/HTTP-status panels to the existing cc-lanes dashboard. #848 already supplies the five collector dimensions on main; this PR has no collector YAML delta after its landing rebase. Host publication remains the CC's operation.

- Base commit: `e450e378c6bf1b21dd0bb565812f84afe028bad5` (CC091807Z landing rebase).
- Lane: `lane:foundation`.
- Owned paths: `observability/lanes_dashboard.py`; generated plan `config/grafana-lanes.json`; the existing writer-identity test fixture; dated decision; own evidence registry entries.

## Pipeline exactness

Dropped the old #851 `traces.span.metrics.*` statements from `transform/privacy`. They matched only direct OTLP metrics named `traces.span.metrics.calls/duration` entering the `metrics` pipeline. Gateway/Harbor connector output instead uses `metrics/spans` and `transform/metric_export_privacy`; it never passes through those statements. No reviewed shipped producer is bound to sending connector-named metrics through that direct OTLP metrics route.

Main's collector YAML is retained byte-for-byte, including #848's five-dimension flow-form line and comment. Its existing export guard retains provider/model/status/outcome. The synthetic test follows that actual connector pipeline and proves dimension export, not causality from the dropped exceptions.

## SOTA sources

- [open-telemetry/[email protected], spanmetricsconnector README](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.162.0/connector/spanmetricsconnector/README.md): additional dimensions and default `traces.span.metrics.calls/duration` names. [Main's processor/pipeline source](https://github.com/seathatflowsinourveins/native-agent-stack/blob/e450e378c6bf1b21dd0bb565812f84afe028bad5/evidence/artifacts/new-wsl-install-plan-20261002/config/otel.yaml#L86) establishes the exact routing and retained dimensions.
- [open-telemetry/semantic-conventions-genai@06ec68e, client-inference.md](https://github.com/open-telemetry/semantic-conventions-genai/blob/06ec68e722c45a7218e23ea1bc1339fe4e21ecae/docs/gen-ai/client-inference.md): `gen_ai.provider.name`; current conventions are Development.
- [cheaper-inference/OmniRoute@c1e30b7, routing/otel.ts:193](https://github.com/diegosouzapw/OmniRoute/blob/c1e30b7676975feb298b49eff6ff58923c04b89e/open-sse/services/routing/otel.ts#L193): vendor `omniroute.routing.status/outcome`, provider/model fields and absent lane/session parentage. Routing status is distinct from OTel `status.code`.
- [openai/codex@9790114, cost emission](https://github.com/openai/codex/blob/979011409de0a60b52f179721948e65531d26144/codex-rs/otel/src/events/session_telemetry.rs#L368), [Claude Code monitoring](https://code.claude.com/docs/en/monitoring-usage#cost-counter), and [Prometheus rate/increase](https://prometheus.io/docs/prometheus/latest/querying/functions/#increase): reset-aware counter queries, micro-USD conversion, separate cost sources and interval-extrapolation limits.
- Existing Grafana13.2.3/Loki3.7.8 native renderer and provisioning formats are reused.

## Evidence-class table

| Claim | Evidence class | Command / receipt |
| --- | --- | --- |
| Dimension names, native cost contracts and processor ownership | source_review | Versioned sources above, immutable main/old-head inspection and dated correction below |
| Generated dashboard matches source; existing publisher contracts remain passing | local_integration | Renderer check and 17 dashboard contract tests |
| Native connector retains provider/status/outcome and merges equal groups | synthetic | Existing fixture sends four synthetic spans through main's connector pipeline; 3 exported groups have counts 2/1/1 |
| Source publisher produces an exact copy; collector accepts it | local_integration | Repository `observability_config.py otel` into a temporary destination, then native `otelcol-contrib validate` |
| Native query parsers accept the eight new targets | local_integration | Read-only Prometheus/Loki query APIs returned success; missing Codex-cost/gateway series remain unknown |
| Deployed collector/gateway export and complete cost coverage | unverified | CC host publication/read-back; no host restart or configuration apply in this PR |

## Local commands run

```text
python3 observability/ns2604_dashboards.py
python3 observability/ns2604_dashboards.py --check
  rc=0
python3 -m unittest tests.test_ns2604_dashboards tests.test_j775_panel_contracts tests.test_observability_writer_identity -v
  rc=0; 43 collected, 39 passed, 4 optional pinned-Prometheus/promtool checks skipped
NS2604_OBSERVABILITY_DATA=<temporary>/data python3 evidence/artifacts/new-wsl-install-plan-20261002/config/observability_config.py otel --source-root <checkout>/evidence/artifacts/new-wsl-install-plan-20261002/config --config-root <temporary>/config
  rc=0; published YAML matches source and named main byte-for-byte
NS2604_OBSERVABILITY_DATA=<temporary>/data otelcol-contrib validate --config=<temporary>/config/otel.yaml
  rc=0; installed collector 0.162.0
python3 scripts/component_matrix.py --write
python3 scripts/new_host_grand_list.py --write
  rc=0; no derived-report changes
python3 scripts/validate.py
  rc=0
git diff --check
  rc=0
```

## Decision record

`docs/decisions/2026-10-08-cc-lanes-rate-cost-gateway.md` records the corrected processor assumption.

Costs are estimates with source-specific coverage. Codex provider enrichment is conditional; `increase()` is not an exact total or guaranteed lower bound. No zero fill is used for missing costs or gateway routing data. Gateway events lack lane/session parentage and are not assigned to client lanes.

## Host evidence

No files under `evidence/hosts/` change, and no deployment acceptance is claimed. The existing native collector integration uses temporary configuration and loopback ports with synthetic input. The runtime lock, broker keys, live Grafana, services and gateway are untouched.

## Checklist

- [x] No GitHub Actions changes.
- [x] No secrets, new credentials, paid hosting or billing surface.
- [x] Peer worktrees preserved; #834 retains its separate landing cue.
- [x] Main registry taken; only own changed files re-registered last.
- [x] Source-only scope respects the paper freeze and quiet window.