[L-02] Fix misleading documentation

[ozgunozerk]

Fixes #931

Fixes audit finding L-02: Misleading Documentation

Documentation-only changes, plus one boundary test. Each item of the finding was checked against current main; the issue has the full assessment.

• List-policy headers: AllowBlockList and the three votes combinations now say that mint does not check the list policy, as for AllowList / BlockList on their own.
• TotalSupplyOverrides: names the contract types that actually implement it, and those that do not (AllowBlockList, FungibleVotes and the votes combinations).
• RWA freeze events: recover_balance documents tokens_unfrozen / tokens_frozen. forced_transfer, burn and their batch forms document tokens_unfrozen, which they emit when the transfer or burn dips into frozen tokens (same gap, not listed in the finding).
• RWA freeze scope: set_address_frozen says a frozen wallet can still act as the spender in transfer_from. recover_balance notes that allowances are neither migrated nor revoked.
• FungibleVault: the "NO AUTHORIZATION CONTROLS" warnings on deposit / mint / withdraw / redeem are replaced with a note that authorization from operator is required, which the contract type already requests. The trait-level note now points the warning at the low-level Vault::*_internal functions.
• Wad::exp: the overflow bound is ≈ 46.583 (the largest result that fits i128), not ≈ 135.305 (the internal i256 limit). A new test pins the exact boundary, 46_583_160_257_220_231_983.
• Smart account lock-out: the README caveats, remove_context_rule, update_context_rule_valid_until and get_context_rules_count explain that the account locks permanently once no valid rule covers calls to the account itself (Default, or CallContract for its own address). This is broader than the finding's "last rule" case: rules scoped to other contracts do not help.
• Upgradeable migration guidance: rewritten for soroban-sdk 28's tolerant unpacking. A missing Option field reads as None, and unknown keys are dropped (and lost on the next write). The example still traps, but for the stated reason now.
• Sparse event data: event docs now note that Option fields are left out of the data when None: ContextRuleAdded / ContextRuleMetaUpdated (valid_until), DelegateChanged (from_delegate, not in the finding), and the confidential compliance events (policy, destination, not in the finding). The fungible transfer trait doc now shows both data shapes, matching Base::transfer.

PR Checklist

• Tests
• Documentation

Summary by CodeRabbit

• Documentation
  • Clarified when account-management rules can leave an account permanently locked and how optional values appear in event data.
  • Updated exponential-function overflow limits and clarified storage migration behavior for contract data.
  • Expanded token documentation on minting policies, voting units, supply tracking, transfer events, frozen balances, and recovery.
  • Clarified vault operator-authorization requirements.

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Walkthrough

This change updates documentation across account, contract utility, governance, confidential, and token packages. It clarifies authorization, event data, migration, and token behavior. Exponential overflow documentation and boundary tests are also updated.

Changes

Documentation corrections

Layer / File(s)	Summary
Smart-account management rules packages/accounts/README.md, packages/accounts/src/smart_account/mod.rs	The documentation explains that management calls require a valid context rule for the account itself. It warns that removing or expiring the last such rule can prevent further management calls.
Optional event fields packages/accounts/src/smart_account/*, packages/confidential/src/compliance/*, packages/governance/src/votes/*	Event documentation states that optional fields are omitted from event data when their values are None.
Exponential limits packages/contract-utils/src/math/{exp_ln.rs,wad.rs}, packages/contract-utils/src/math/test/wad.rs	The documentation gives the exponential result ceiling and lower-input truncation behavior. Tests check the largest successful input, the next raw input, and input 100.
Upgradeable storage migration guidance packages/contract-utils/src/upgradeable/mod.rs	The documentation describes SDK 28 handling of named-field structs and the migration implications for missing and unknown fields.
Fungible token documentation packages/tokens/src/fungible/{extensions/combinations/storage.rs,mod.rs,overrides.rs}	The documentation clarifies list checks for minting, voting-unit updates, transfer event data, and TotalSupplyOverrides implementations.
RWA freeze and recovery documentation packages/tokens/src/rwa/{mod.rs,storage.rs}	The documentation describes freeze-related events, recovery allowance behavior, and spending from another account when the spender address is frozen.
Vault operator authorization packages/tokens/src/vault/mod.rs	The documentation identifies operator authorization on deposit, mint, withdraw, and redeem, and cautions overrides against repeating that authorization request.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Other · Severity of issue fixed: Low

Suggested reviewers: brozorec

Merge Risk: 🔵 Low · up to 75acd

Correct the authorization caveat before relying on this public documentation.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue [#931] requires corrections to misleading documentation and the Wad::exp bound. The PR summary reports updates for list-policy mint behavior, TotalSupplyOverrides, RWA freeze events and froz…
Out of Scope Changes check	✅ Passed	The changed documentation and test relate to the misleading behavior described in issue [#931]. The additional RWA batch-event, fungible transfer event-shape, and related Option-field clarifications…
Docstring Coverage	✅ Passed	Docstring coverage is 93.75% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 16 files. (1 skipped: 1…
Title check	✅ Passed	The title clearly identifies the primary change: correcting misleading documentation related to audit finding L-02.
Description check	✅ Passed	The description identifies issue #931, explains the documentation changes and boundary test, and marks both checklist items complete.

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---

_{A rabbit reads the rulebook by the moon,
And finds the bounds that tests now check.
Event fields tuck away when none are set,
While token notes explain each flow.
The burrow rests with clearer pages.}

_{Comment @coderabbitai help to get the list of available commands.}

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✅ All modified and coverable lines are covered by tests.

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/tokens/src/vault/mod.rs:
- Line 199: Update all four authorization notes in the vault module to qualify
that repeated operator.require_auth() calls fail only when callers cannot
authorize each request with a matching authorization tree; preserve the
surrounding documentation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6eb047d and 75acdf2.

📒 Files selected for processing (17)

• packages/accounts/README.md
• packages/accounts/src/smart_account/mod.rs
• packages/accounts/src/smart_account/storage.rs
• packages/confidential/src/compliance/mod.rs
• packages/confidential/src/compliance/storage.rs
• packages/contract-utils/src/math/exp_ln.rs
• packages/contract-utils/src/math/test/wad.rs
• packages/contract-utils/src/math/wad.rs
• packages/contract-utils/src/upgradeable/mod.rs
• packages/governance/src/votes/mod.rs
• packages/governance/src/votes/storage.rs
• packages/tokens/src/fungible/extensions/combinations/storage.rs
• packages/tokens/src/fungible/mod.rs
• packages/tokens/src/fungible/overrides.rs
• packages/tokens/src/rwa/mod.rs
• packages/tokens/src/rwa/storage.rs
• packages/tokens/src/vault/mod.rs

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