fix(load): unblock first load of an absent extension

[zeegin]

Migrated from alkoleft/v8-runner-rust pr #54.
Original author: zeegin; created: 2026-08-14T14:21:16Z.
Upstream historical base: 7ce1b062; original head: 442cfc0e.
This PR was rebuilt on the IngvarConsulting fork and the original attribution is preserved here.

Problem

The first load of a CFE absent from the infobase is blocked by the compatibility probe. On platform 8.3.27.2130 Designer returns non-zero with the exact /Out line:

Конфигурация 'Расширение конфигурации' недоступна

The migrated patch originally widened substring matching to unavailable and Unicode-lowercased every branch. Independent review found that this could combine unrelated extension and server/license diagnostics and authorize a mutating /LoadCfg.

Downstream reproduction: IngvarConsulting/unica#355

Rebuilt contract

• Adds the explicit JSON state compatibility_state: "absent" for v0.6.
• Allows load + absent for the first installation.
• Rejects merge + absent with an actionable first-installation hint.
• Accepts the observed absent state only from one exact clean current /Out diagnostic, with empty stdout/stderr, no interruption, no read error, and no extra lines.
• Uses a closed whole-diagnostic allowlist for other non-zero compatibility outcomes; independent substrings are never combined.
• Returns every unclassified non-zero probe as a platform failure and never runs /LoadCfg or /MergeCfg.
• Fails before spawning Designer when the previous /Out cannot be removed, preventing stale evidence reuse.
• Keeps unverified English/localized wording fail-closed until a real wire capture is available.

The public and safety contract is recorded in ADR-0023 and spec/architecture/invariants.md.

Verification

Passed locally:

• cargo fmt --check
• git diff --check
• cargo test --locked --bin v8-runner load_artifact — 22 passed
• cargo test --locked --test cli_load — 9 passed
• independent tester, reviewer, skeptic, and Rust-expert passes; final reviewer and Rust expert reported no remaining actionable findings

Regression coverage includes first install order CompareCfg -> LoadCfg -> UpdateDBCfg, absent JSON serialization, merge hint, BOM/CRLF, mixed stdout/stderr/log evidence, access/auth/license/connection errors, unreadable /Out, stale /Out, and unverified English wording.

The broad local contract suite still has the fork's pre-existing macOS environment failures (path canonicalization and process startup timeouts). GitHub CI is the merge gate for the rebuilt head.

[zeegin]

Upstream comment by coderabbitai[bot] at 2026-08-14T14:21:47Z: original

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: df0c1ae8-34d7-4863-b892-1b32fcb89e07

📥 Commits

Reviewing files that changed from the base of the PR and between 7ce1b06 and 442cfc0.

📒 Files selected for processing (1)

• src/use_cases/load_artifact.rs

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Walkthrough

Классификатор ошибок пробирования теперь корректно обрабатывает Unicode-регистр и дополнительные английские и русские сообщения о недоступных расширениях. Тесты проверяют состояние NotSupported для таких сообщений и Unknown для нерелевантной ошибки.

Changes

Классификация ошибок пробирования

Layer / File(s)	Summary
Обновление классификатора src/use_cases/load_artifact.rs	classify_probe_failure использует to_lowercase() и распознаёт сообщения unavailable, not available и недоступ.
Тесты классификатора src/use_cases/load_artifact.rs	Добавлены проверки английских и русских сообщений с состоянием NotSupported, а также нерелевантной ошибки с состоянием Unknown.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 442cf

The PR narrowly expands compatibility-error classification so the first load of an absent extension can proceed; no actionable merge-blocking risk remains after normal checks and review.

Poem

Я兔ик вижу: регистр стал точней,
Русский текст распознан теперь быстрей.
Расширение недоступно — NotSupported,
Ошибка чужая — Unknown сохранён.
Тесты прыгают в строках: раз, два, три!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Заголовок точно описывает основное изменение: исправление первой загрузки отсутствующего расширения.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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