Give each sweep its own Copilot concurrency group (#127)

By default the gh-aw compiler injects
`concurrency.group: "gh-aw-copilot-${{ github.workflow }}"`
on the agent job of every Copilot-engine workflow, with
`cancel-in-progress: true`. `github.workflow` resolves at
workflow_call time to the *caller's* workflow name, so when the
docs-quality-sweep orchestrator dispatches the seven sweeps in
parallel they all end up in the same group named
`gh-aw-copilot-Docs quality sweep`. As each agent job queues, the
one currently running gets cancelled with annotation
`Canceling since a higher priority waiting request for
gh-aw-copilot-Docs quality sweep exists`.

Override this per-source via `engine.concurrency` (documented at
https://github.github.com/gh-aw/reference/concurrency/) so each
sweep's agent job lands in its own group keyed on its own slug
plus `github.run_id`. The seven groups are now mutually
non-overlapping and each is also distinct across runs.

Verified by recompiling and inspecting the lock files: each
contains its own
`group: "gh-aw-copilot-docs-<slug>-sweep-${{ github.run_id }}"`,
and none of them keep the default
`"gh-aw-copilot-${{ github.workflow }}"`.

Refs the cancellation observed in
elastic/docs-content-internal/actions/runs/25368098299 (5 of 7
agent jobs cancelled within 50s of each other; only `typos`
finished because its agent step was short enough to win the race).

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: theletterf

.github/workflows/gh-aw-docs-applies-to-sweep.lock.yml

@@ -15,6 +15,9 @@ imports:
         - elastic/elastic-docs-skills/skills/authoring/applies-to-tagging
 engine:
   id: copilot
+  concurrency:
+    group: "gh-aw-copilot-docs-applies-to-sweep-${{ github.run_id }}"
+    cancel-in-progress: false
 on:
   workflow_call:
     inputs:

.github/workflows/gh-aw-docs-applies-to-sweep.md

@@ -13,6 +13,9 @@ imports:
   - gh-aw-fragments/mcp-pagination.md
 engine:
   id: copilot
+  concurrency:
+    group: "gh-aw-copilot-docs-coherence-sweep-${{ github.run_id }}"
+    cancel-in-progress: false
 on:
   workflow_call:
     inputs:

.github/workflows/gh-aw-docs-coherence-sweep.lock.yml

@@ -17,6 +17,9 @@ imports:
         - elastic/elastic-docs-skills/skills/authoring/frontmatter-description
 engine:
   id: copilot
+  concurrency:
+    group: "gh-aw-copilot-docs-frontmatter-sweep-${{ github.run_id }}"
+    cancel-in-progress: false
 on:
   workflow_call:
     inputs: