[Contracts] storage.rs read/write helpers have no doc comments explaining TTL/bump semantics

[grantfox-oss]

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Why this matters

storage.rs centralizes ledger reads and writes for streams and config, but the functions have no rustdoc explaining storage key layout or ledger TTL bump behavior, which makes it hard for new contributors to reason about persistence costs.

Acceptance criteria

• Add rustdoc to each public function in storage.rs describing the key it touches and any TTL bump it performs
• Document the storage key enum/variants used across the module
• No behavior change, comments only

Files to touch

• contracts/stream_contract/src/storage.rs

Out of scope

Does not change storage layout or add new storage entries.

[Jumongweb]

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Hi maintainer, i will like to solve this issue

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[CARTEL-L]

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Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

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[Joyful12-tech]

@Joyful12-tech has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I’d like to work on this issue

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