[autonomy-atomicity] Internal deep-dive workflow concurrency key cancels unrelated runs

## Autonomy / Atomicity Findings

### 1. Static concurrency group in deep-dive workflow cancels independent investigations
**Category:** Ordering dependency
**File(s):** `.github/workflows/agent-deep-dive.md` (lines 18-20, 22-29, 33-35)

**Problem:**
`agent-deep-dive` supports both scheduled execution and manual `workflow_dispatch`, including per-run inputs (`target-workflow`, `run-count`). However, it uses a single static concurrency key:

```yaml
concurrency:
group: $\{\{ github.workflow }}-agent-deep-dive
cancel-in-progress: true
```

With this key, any newly started run cancels any in-flight run, even when investigating a different target workflow. In concurrent development, two maintainers/agents running separate deep dives can invalidate each other’s work, and scheduled runs can preempt manual investigations.

**Suggested fix:**
Scope the concurrency group to run intent (for example, include `inputs.target-workflow` and/or `github.ref`) so independent deep dives can run without collision. Keep cancellation behavior only for truly duplicate runs.

## Suggested Actions
- [ ] Update `.github/workflows/agent-deep-dive.md` concurrency key to include differentiators such as `inputs.target-workflow` (fallback when empty) and `github.ref`, then recompile.
- [ ] Decide whether `cancel-in-progress` should remain `true` for manual dispatches, or be limited to scheduled duplicate runs.

> [!NOTE]
>
> 🔒 Integrity filter blocked 26 items
>
> The following items were blocked because they don't meet the GitHub integrity level.
>
> - [#490](https://github.com/elastic/ai-github-actions/pull/490) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#418](https://github.com/elastic/ai-github-actions/pull/418) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#937](https://github.com/elastic/ai-github-actions/pull/937) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#608](https://github.com/elastic/ai-github-actions/pull/608) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#643](https://github.com/elastic/ai-github-actions/pull/643) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#641](https://github.com/elastic/ai-github-actions/pull/641) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#767](https://github.com/elastic/ai-github-actions/pull/767) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#399](https://github.com/elastic/ai-github-actions/pull/399) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#537](https://github.com/elastic/ai-github-actions/pull/537) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#546](https://github.com/elastic/ai-github-actions/pull/546) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#675](https://github.com/elastic/ai-github-actions/pull/675) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#697](https://github.com/elastic/ai-github-actions/pull/697) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#851](https://github.com/elastic/ai-github-actions/pull/851) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#599](https://github.com/elastic/ai-github-actions/pull/599) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#504](https://github.com/elastic/ai-github-actions/pull/504) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - [#461](https://github.com/elastic/ai-github-actions/pull/461) `search_pull_requests`: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
> - ... and 10 more items
>
> 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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[What is this?](https://ela.st/github-ai-tools) | [From workflow: Trigger Autonomy Atomicity Analyzer](https://github.com/elastic/ai-github-actions/actions/runs/25509202255)

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