fix(zetaclient): backport respect DisableTssBlockScan in Bitcoin observer

[skosito]

original PR #4597

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

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Note

Medium Risk
When DisableTssBlockScan is enabled, Bitcoin inbound deposits will no longer be observed/voted on (by design), so misconfiguration could halt deposit processing; changes are otherwise localized with added unit coverage.

Overview
Respects DisableTssBlockScan for Bitcoin inbound handling. The Bitcoin observer now returns early from both ObserveInbound block-range scanning and observeInboundTrackers processing when ChainParams.DisableTssBlockScan is true, emitting sampled info logs.

Adds unit tests asserting that with the flag enabled, neither block scanning nor inbound-tracker processing attempts any Bitcoin RPC calls and the methods exit cleanly.

^{Reviewed by Cursor Bugbot for commit 3b718ef. Configure here.}

Greptile Summary

This PR ports the DisableTssBlockScan guard from the EVM observer to the Bitcoin observer, ensuring that when the flag is set both ObserveInbound and observeInboundTrackers return early without scanning or voting on inbound transactions.

• inbound.go: guard is inserted after updateLastBlock (preserving block-height tracking) but before any scanning, matching the intent of the flag.
• inbound_tracker.go: guard is inserted at the top of observeInboundTrackers, covering both external (ProcessInboundTrackers) and internal (ProcessInternalTrackers) tracker paths via the shared helper.
• inbound_test.go: two new tests confirm the early-return behaviour by relying on testify mock's strict unexpected-call detection.

Confidence Score: 4/5

The change is a targeted, minimal flag-check insertion with no impact on outbound processing; safe to merge.

Both guard locations are correct and the logic is straightforward. The only gap is that the public callers ProcessInboundTrackers and ProcessInternalTrackers still perform preliminary network/state work before the guard is reached inside observeInboundTrackers, and neither is covered by a dedicated test. This is a minor quality concern rather than a functional defect.

zetaclient/chains/bitcoin/observer/inbound_test.go — the tests exercise observeInboundTrackers directly but do not cover the public ProcessInboundTrackers and ProcessInternalTrackers entry-points.

Important Files Changed

Filename	Overview
zetaclient/chains/bitcoin/observer/inbound.go	Adds an early-return guard for DisableTssBlockScan after updateLastBlock; consistent with existing EVM pattern
zetaclient/chains/bitcoin/observer/inbound_tracker.go	Adds DisableTssBlockScan guard at the top of observeInboundTrackers; covers both external and internal tracker paths
zetaclient/chains/bitcoin/observer/inbound_test.go	Adds two tests verifying early-return behaviour; relies on testify mock's strict-call detection but ProcessInboundTrackers/ProcessInternalTrackers callers are not covered

Sequence Diagram

sequenceDiagram
    participant Scheduler
    participant Observer

    Note over Scheduler,Observer: ObserveInbound path
    Scheduler->>Observer: ObserveInbound(ctx)
    Observer->>Observer: updateLastBlock(ctx)
    alt "DisableTssBlockScan == true"
        Observer-->>Scheduler: return nil (early exit)
    else "DisableTssBlockScan == false"
        Observer->>Observer: observeInboundInBlockRange(...)
        Observer-->>Scheduler: return nil
    end

    Note over Scheduler,Observer: ProcessInboundTrackers path
    Scheduler->>Observer: ProcessInboundTrackers(ctx)
    Observer->>Observer: GetInboundTrackers(ctx)
    Observer->>Observer: observeInboundTrackers(ctx, trackers, false)
    alt "DisableTssBlockScan == true"
        Observer-->>Scheduler: return nil (early exit)
    else "DisableTssBlockScan == false"
        Observer->>Observer: CheckReceiptAndPostVoteForBtcTxHash(...)
        Observer-->>Scheduler: return nil
    end

    Note over Scheduler,Observer: ProcessInternalTrackers path
    Scheduler->>Observer: ProcessInternalTrackers(ctx)
    Observer->>Observer: GetInboundInternalTrackers(ctx)
    Observer->>Observer: observeInboundTrackers(ctx, trackers, true)
    alt "DisableTssBlockScan == true"
        Observer-->>Scheduler: return nil (early exit)
    else "DisableTssBlockScan == false"
        Observer->>Observer: CheckReceiptAndPostVoteForBtcTxHash(...)
        Observer-->>Scheduler: return nil
    end

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Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
zetaclient/chains/bitcoin/observer/inbound_test.go:149-163
**Test does not cover public callers (`ProcessInboundTrackers` / `ProcessInternalTrackers`)**

The guard lives inside `observeInboundTrackers`, but `ProcessInboundTrackers` still calls `ob.ZetaRepo().GetInboundTrackers(ctx)` and `ProcessInternalTrackers` still calls `ob.GetInboundInternalTrackers` before reaching the guard. Those callers are the ones actually triggered by the scheduler, yet neither is covered by a test here. A test for each public entry-point would confirm the full intended behaviour (and would also catch any future guard-bypass regression if the guard is accidentally moved or removed in a refactor).

_{Reviews (1): Last reviewed commit: "fix(zetaclient): respect DisableTssBlock..." | Re-trigger Greptile}

Greptile also left 1 inline comment on this PR.

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✅ All modified and coverable lines are covered by tests.

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