feat(ops): indexer + treasury ops bundle (#283–#286)

[fytgian]

Bundled delivery of the four Stellar Wave indexer/ops issues assigned to @fytgian.

Changes

• Replay-idempotent event IDs documented and tested per DASHBOARD_SYNC.md #283 — replay-idempotent event IDs. Documents a stable event ID scheme {network_id}:{contract_id}:{ledger_sequence}:{tx_hash}:{event_index} in DASHBOARD_SYNC.md / EVENT_INDEXING.md, plus the consumer dedup algorithm. Adds tests/event_replay.rs (a reference consumer proving a full re-sync is a no-op) and a language-neutral tests/testdata/event_replay_fixture.json.
• GraphQL subgraph schema for Registered, Verified, and Removed #284 — GraphQL subgraph schema. New docs/subgraph/ with schema.graphql (RegisteredEvent, VerifiedEvent, RemovedEvent + derived Contributor), the event→entity mapping, handler sketch, example query, and local-run notes. Field names/types mirror src/events.rs; RegisteredEvent correctly has no domain, reason_code is absent, batch-remove collisions are handled via eventIndex. No payload fields invented.
• Payout allowlist CSV generator from get_public_paginated with verified-only mode #285 — payout allowlist CSV. New scripts/payout_allowlist.{py,sh} paginating the unauthenticated get_public_paginated read (no admin key), verified-only by default, bots excluded, with pagination-completeness guarding. Columns aligned with the JSON export plus payout_address.
• Dashboard bulk-verify adapter that calls batch_verify with pacing #286 — bulk-verify batch adapter. scripts/bulk_verify.sh now calls batch_verify in pages of MAX_WRITE_BATCH (25) with automatic per-username verify fallback for older contracts, pacing, dry-run, BatchSummary partial-success handling, and per-batch audit logging.
• ADMIN_RUNBOOK.md documents both scripts; .gitignore ignores __pycache__.

Validation

• bash -n on both shell scripts; python3 -m py_compile on the Python modules — pass.
• Rust toolchain is not available in this environment, so cargo fmt/clippy/test were not run locally; tests/event_replay.rs is std-only and #[rustfmt::skip] is applied to the fixture table. CI covers fmt/clippy/test.

Closes: #283
Closes: #284
Closes: #285
Closes: #286

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@fytgian Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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