starknet_committer: name TrieReadTask lifetimes and document them

[yoavGrs]

The struct now uses 'indices / 'updates / 'storage instead of 'a / 'u /
's, and the doc comment explains why two non-storage lifetimes are
needed: unifying them would make the returned OriginalSkeletonForest
appear to borrow the storage update maps too, preventing the compute
phase from moving those maps by value.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

[reviewable-StarkWare]

This change is 

[yoavGrs]

• starknet_committer: name TrieReadTask lifetimes and document them #14239 👈 (View in Graphite)
• starknet_committer: derive skeleton updates from actual updates #14214
• starknet_committer: split commit_block into read and compute phases #14213
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[cursor]

PR Summary

Low Risk
Comment and lifetime-parameter renames only; no runtime or commit-path behavior changes.

Overview
Renames opaque lifetime parameters on TrieReadTask and its StorageTask impls to 'indices, 'updates, and 'storage, and expands the struct doc to spell out why 'indices and 'updates must stay separate (so OriginalSkeletonForest does not appear to borrow storage update maps and block moving them into the compute phase in commit_block).

No logic or API behavior changes—only naming and comments in trie_traversal.rs.

^{Reviewed by Cursor Bugbot for commit bd2416b. Bugbot is set up for automated code reviews on this repo. Configure here.}

[dorimedini-starkware]

@dorimedini-starkware reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on yoavGrs).

[ArielElp]

@ArielElp reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on yoavGrs).

[graphite-app]

Merge activity

• May 29, 10:01 AM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.

[dorimedini-starkware]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on yoavGrs).