Handle usage-limit reset credits

[andrei-hasna]

Summary

• Adds usage-limit reset credit protocol/types/schema artifacts and app-server consume RPC coverage.
• Adds config-gated automatic reset handling and /usage TUI presentation for reset credits.
• Includes focused tests for app-server rate-limit reset status/consume flow, backend-client parsing, config, and TUI rendering.
• Adds a follow-up formatting-only commit after PR CI reported rustfmt drift.

Current branch state

• Head: fe2ca838b11682c5443eaf6e00b4487b577b606d (Format usage reset hotfix).
• Base: main.
• Branch: hotfix/usage-limit-reset-20260711.
• Ahead of origin/main by 3 commits.

Local validation on station02

• git status --porcelain=v1 --branch: clean on hotfix/usage-limit-reset-20260711.
• git rev-parse HEAD: fe2ca838b11682c5443eaf6e00b4487b577b606d.
• git rev-list --left-right --count origin/main...HEAD: 0 3.
• git diff --check origin/main..HEAD: passed.
• Co-Authored-By trailer scan over origin/main..HEAD: absent.
• shield review before the formatting commit: no security issues in staged changes.
• Staged and branch diff secret-pattern scans: passed without printing candidate values.
• Local Rust/codegen validation not run: cargo/rustfmt are not installed on station02, and local heavy Rust/Bazel builds were intentionally skipped for this prep pass.

Remote validation status

• PR CI triggered automatically for the pushed branch.
• Initial CI at 3b355368953599f5ae04628b7e457c78e123926e failed Format / etc and build-test due cargo fmt --check drift.
• Formatting-only repair commit fe2ca838b11682c5443eaf6e00b4487b577b606d was pushed; wait for the new PR CI run on that head.

Required remote validation

Run in a Rust/Bazel-capable environment before merge:

just write-config-schema
just write-app-server-schema
just test -p codex-app-server-protocol
just test -p codex-app-server consume_rate_limit_reset_credit

Draft until those remote gates pass.

[andrei-hasna]

Queue state: deferred to the app-server/protocol lane, not merge-ready in the infra/skill lane.

Reason: this PR is draft, currently conflicts with main, and touches broad app-server/protocol/TUI/backend-client/core config surfaces. The body also says it is draft until remote gates pass.

Required before undraft/merge consideration:

• rebase/restack on current main and resolve conflicts;
• run all generated schema/config updates inside E2B only, including just write-config-schema and just write-app-server-schema where applicable;
• run E2B-only focused validation for just test -p codex-app-server-protocol plus impacted app-server/TUI/backend-client tests;
• obtain owner review and adversarial review on the exact final head.

No local compile/schema output from spark01 is accepted as evidence for this PR.