docs: fix stale cursor doc in NatSpec (#128)

[thedavidmeister]

Summary

Doc-only fixups found while auditing remaining cursor uses after #139 / #140.

Fixes:

• `ICorporateActionsV1.getActionParameters` NatSpec described the input as "a cursor returned from one of the traversal getters" — but the API return is data crossing the boundary, so it's an `actionId` per the rename convention. Same fix on the "mask the cursor's actionType" line below.
• `LibCorporateActionReceipt.accountIdCursor` comment claimed "1-based index" with "0 = never migrated". Stale post-PR-124: indexing is 0-based and `cursor == 0` is the bootstrap node (identity for splits), semantically "no real migration applied yet".

No code changes, no bytecode impact.

After this lands, #128 can close — every remaining `cursor` reference in src/ is either a storage variable holding state-machine progress over time, a local variable during a walk, or descriptive prose about the cursor concept. All legitimate per the convention documented in the interface NatSpec.

Test plan

• static analysis (CI)
• legal (CI)
• no test changes — doc only

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2daff8fd-d08d-4918-8e4c-5ae5c2363435

📥 Commits

Reviewing files that changed from the base of the PR and between 2019864 and 1105c6a.

📒 Files selected for processing (2)

• src/interface/ICorporateActionsV1.sol
• src/lib/LibCorporateActionReceipt.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/issue-128-fixup-stale-cursor-doc

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