wraith_metrics wiring into wraith-names, splitter, vault, governance

[truthixify]

Tier: M (2-4 days) | Type: feature

Context. stellar/wraith-metrics/src/lib.rs defines a v1 metric event schema (topic ("metric", contract, metric_name) + data (value, dimensions)), and stellar/METRICS.md documents standard metric names. Today only stealth-sender, stealth-registry, and stealth-batch-sender emit through it. wraith-names, stealth-splitter, stealth-vault, and the governance PoC do not emit anything, and the METRICS.md per-contract tables for those four are missing. The Grafana dashboard at stellar/scripts/metrics-indexer/grafana-dashboard.json therefore has blank panels for those contracts.

Scope.

• Add wraith_metrics::emit_metric calls for the natural counter / volume metrics on each of the four contracts (see METRICS.md standard names): names (register_count, renew_count, release_count, resolve_hit_count, resolve_miss_count), splitter (create_count, fund_count, fund_volume, beneficiaries_per_split), vault (deposit_count, deposit_volume, claim_count, refund_count), governance (proposal_count, vote_count, execution_count).
• Populate the four missing per-contract tables in stellar/METRICS.md.
• Add panels to stellar/scripts/metrics-indexer/grafana-dashboard.json for the new metric names.
• Extend the indexer at stellar/scripts/metrics-indexer/index.js to include the four new contract topic filters.

Acceptance.

• Each of the four contracts has at least one integration test asserting on the emitted WraithMetricEvent shape
• stellar/METRICS.md per-contract tables cover all four (no blank rows)
• Grafana dashboard renders panels for the new metrics against a synthetic event stream
• Optimized wasm size delta for each contract recorded in stellar/SIZE.md (metric emission adds bytes)

Files. stellar/wraith-names/src/lib.rs, stellar/stealth-splitter/src/lib.rs, stellar/stealth-vault/src/lib.rs, stellar/contracts/governance/src/lib.rs, stellar/METRICS.md, stellar/scripts/metrics-indexer/grafana-dashboard.json, stellar/scripts/metrics-indexer/index.js, stellar/SIZE.md.

[DSOTec]

@DSOTec has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I would like to work on this issue. Please kindly assign.

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