fix: increase token optimizer timeout and tighten prompt (#1990)

* fix: increase token optimizer timeout and tighten prompt

- Increase timeout-minutes from 15 to 25 to prevent premature
  termination (the agent was actively working when killed)
- Add focus instruction to prevent agent from exploring unrelated
  workflow files
- Trim redundant prompt sections to reduce token overhead
- Remove post-agent steps mention (not used in this workflow)

Closes #1989

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: clarify focus instruction per review feedback

Reword the IMPORTANT directive to explicitly allow:
- Fetching the token usage report issue via gh issue commands
- Scanning workflow filenames via grep to resolve the target
- Reading the single target workflow file

While still prohibiting reading unrelated workflow contents.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

.github/aw/actions-lock.json

@@ -45,15 +45,10 @@
       "version": "v4.0.0",
       "sha": "4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd"
     },
-    "github/gh-aw-actions/setup-cli@v0.68.1": {
-      "repo": "github/gh-aw-actions/setup-cli",
-      "version": "v0.68.1",
-      "sha": "2fe53acc038ba01c3bbdc767d4b25df31ca5bdfc"
-    },
-    "github/gh-aw-actions/setup@v0.68.1": {
+    "github/gh-aw-actions/setup@v0.68.2": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.68.1",
-      "sha": "2fe53acc038ba01c3bbdc767d4b25df31ca5bdfc"
+      "version": "v0.68.2",
+      "sha": "19c436149e80e5be4f0adbd9cdeb391acea5fa91"
     },
     "github/gh-aw/actions/setup@v0.68.1": {
       "repo": "github/gh-aw/actions/setup",