Follow-up after #14 and #20.

Context

direct-cli now has a stable integration_write suite with replayable VCR cassettes.
The current contract is effectively 10 passed, 9 intentionally skipped because some
write scenarios are limited by Yandex Direct sandbox behavior rather than by missing CLI implementation.

This issue tracks the next phase: deciding how to expand write-test confidence beyond the
current sandbox ceiling.

Problem

Some write flows still cannot be validated as successful end-to-end in the current Yandex Direct sandbox.
This leaves a ceiling on how much live integration confidence direct-cli can gain from sandbox replay/record alone.

Roadmap

1. Classify every currently skipped write scenario

For each currently skipped scenario, decide whether it is:

• permanently sandbox-limited
• fixable with better fixtures or resource chains
• only testable outside sandbox
• better covered by stronger dry-run or cassette regression guards

2. Re-evaluate specialized fixtures for nested resources

Check whether better fixture topology can unlock more reliable success-path coverage for:

• ads
• keywords
• keywordbids
• audiencetargets
• dynamicads
• smartadtargets

3. Decide whether a separate non-sandbox integration tier is needed

If some scenarios cannot be made reliable in sandbox, decide whether they should move into a separate integration tier with different prerequisites and expectations.

4. Document the coverage matrix explicitly

Make covered vs sandbox-limited vs other-tier-required explicit in repo docs and/or test headers so issue closure is based on a stable contract rather than on inference.

Acceptance Criteria

• every currently skipped write scenario has an explicit classification
• each classification has a chosen next-step testing strategy
• repo documentation clearly distinguishes:
  • replay-covered success-path tests
  • intentional sandbox-limited skips
  • scenarios that require a different testing tier

Notes

This is not a bug issue. It is a test-strategy roadmap issue for going beyond the current Yandex sandbox ceiling.