[LOW] release_milestone_multi_asset emits undocumented ms_skip topic; should use documented milestone_release_skipped

[Alqku]

Overview

campaign/src/multi_asset_release.rs emits a non-standard internal topic ("ms_skip", "no_issuer") (line 127) when a milestone release skips an asset without an issuer — e.g. native XLM handled separately. Each leg uses symbol_short!(...) which fits only up to 9 ascii characters — the second symbol "no_issuer" is exactly 9, the first "ms_skip" is 7. Both fall under the budget. The bigger problem is that this internalised step-event is never documented in docs/events.md, so off-chain indexers that grep the contract's documentation see no event with topic "ms_skip" and miss the trace. The choice of a global topic namespace per-internal-step also makes it hard to distinguish from any other future event that wants the same snake_case key.

Evidence

// campaign/src/multi_asset_release.rs (in release_milestone_multi_asset's per-asset loop)
Some(addr) => addr.clone(),
None => {
    env.events().publish(
        (symbol_short!("ms_skip"), symbol_short!("no_issuer")),
        (milestone_index, asset.asset_code.clone()),
    );
    continue;
}

docs/events.md (the canonical events index per closed #15) lists every other milestone / campaign event but has no entry for an ms_skip topic.

Impact

• Off-chain indexers reading docs/events.md cannot decode skips, treating them as silent drops in the campaign progress trace.
• A future event accidentally using ("ms_skip", …) from a different module would silently collide with this internal one.
• Operators relying on get_milestone_view cannot tell from an event log why release didn't transfer anything for one of the accepted assets.

Recommended Approach

Move skip events onto a unified, documented topic — and document them.

• Use ("campaign", "milestone_release_skipped") (consistent with the other lifecycle event topics in docs/events.md).
• Include the same payload: (milestone_index, asset_code, reason). Encode reason as a small enum or a plain Symbol ("no_issuer", "dust_below_minimum", "zero_release_amount", "already_released") so downstream tooling can branch.
• Add a section to docs/events.md covering the new event.
• Optionally also emit a single milestone_release_completed summary event after the loop so dashboards know the milestone is done.

Concrete patch sketch:

env.events().publish(
    ("campaign", "milestone_release_skipped"),
    (milestone_index, asset.asset_code.clone(), symbol_short!("no_issuer")),
);

Acceptance Criteria

• Skip events emitted through the documented topic ("campaign", "milestone_release_skipped")
• docs/events.md lists the new event with topics, payload fields, and the reason enum
• Off-host indexer can decode the same payload across multi-asset and single-asset release paths
• Negative-path test exercises the skip for native XLM (Some(asset) with issuer == None) and asserts the event fires
• Top-level summary event (milestone_release_completed) fires after the per-asset loop with (milestone_index, total_released, asset_count, timestamp) so indexers can detect the end of release without counting per-asset events

Affected Files

• campaign/src/multi_asset_release.rs
• docs/events.md
• campaign/src/test/release_milestone_tests.rs

[Tobi-8]

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[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process.
My PR will be submitted in under 1day.

[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process.
My PR will be submitted in under 1days.

[grantfox-oss]

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Next steps:

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