[breaking-change] Undocumented breaking changes detected (2026-06-03)

Recent commits introduced a breaking compatibility change that appears undocumented.

## Breaking Changes

### 1. Imperva Cloud WAF support range was narrowed without migration notice
**Commit(s):** [`b0facda208`](https://github.com/elastic/integrations/commit/b0facda20892d9c681ac9c2c513fa83e25cfe0e7)
**PR:** [#18227](https://github.com/elastic/integrations/pull/18227)
**What broke:** The package compatibility contract for Kibana was tightened from `^8.19.0 || ^9.0.0` to `^8.19.16 || ~9.3.5 || ^9.4.1`, which drops previously supported versions (`8.19.0-8.19.15`, `9.0.0-9.3.4`, and `9.4.0`). Users on those versions can no longer install/upgrade this integration version.
**Evidence:**
- `packages/imperva_cloud_waf/manifest.yml` (kibana condition changed in this commit)
- Diff in commit `b0facda208`: `conditions.kibana.version` changed from `^8.19.0 || ^9.0.0` to `^8.19.16 || ~9.3.5 || ^9.4.1`
**Why undocumented:**
- PR title/body describe agentless support, but do not call out the compatibility contraction or migration path.
- `packages/imperva_cloud_waf/changelog.yml` entry for `1.14.0` only says "Enable Agentless deployment."
- `packages/imperva_cloud_waf/docs/README.md` adds agentless details but no version-compatibility break notice.
**Suggested fix:** Add explicit breaking-change note and migration guidance (minimum supported Kibana versions and upgrade path) in changelog/release notes and package docs.

## Suggested Actions
- [ ] Document this breaking compatibility change in changelog/release notes
- [ ] Add migration guidance for users on now-unsupported Kibana versions

> [!NOTE]
>
> 🔒 Integrity filter blocked 17 items
>
> The following items were blocked because they don't meet the GitHub integrity level.
>
> - [#19209](https://github.com/elastic/integrations/pull/19209) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18337](https://github.com/elastic/integrations/pull/18337) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#19218](https://github.com/elastic/integrations/pull/19218) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18621](https://github.com/elastic/integrations/pull/18621) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#19276](https://github.com/elastic/integrations/pull/19276) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#19259](https://github.com/elastic/integrations/pull/19259) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#19293](https://github.com/elastic/integrations/pull/19293) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18503](https://github.com/elastic/integrations/pull/18503) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18552](https://github.com/elastic/integrations/pull/18552) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18525](https://github.com/elastic/integrations/pull/18525) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#19071](https://github.com/elastic/integrations/pull/19071) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#18227](https://github.com/elastic/integrations/pull/18227) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#13002](https://github.com/elastic/integrations/issues/13002) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#15147](https://github.com/elastic/integrations/issues/15147) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#14186](https://github.com/elastic/integrations/issues/14186) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#11952](https://github.com/elastic/integrations/issues/11952) `search_issues`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - ... and 1 more item
>
> To allow these resources, lower `min-integrity` in your GitHub frontmatter:
>
> ```yaml
> tools:
> github:
> min-integrity: approved # merged | approved | unapproved | none
> ```
>
>

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