Support repo-assist command input from gh aw run

Co-authored-by: dsyme <7204669+dsyme@users.noreply.github.com>

Author: Copilot

docs/repo-assist.md

@@ -141,6 +141,12 @@ You can run Repo Assist in "blast mode" by repeatedly triggering:
 gh aw run repo-assist --repeat 30
 ```
 
+You can also invoke a predefined instruction directly from the command line:
+
+```bash
+gh aw run repo-assist --repo <owner>/<repo> -F command="Run Task 9"
+```
+
 ### Usage as a General-Purpose Assistant
 
 You can also trigger Repo Assist on-demand by commenting on any issue or PR:

workflows/repo-assist.md

@@ -182,9 +182,9 @@ steps:
 
 ## Command Mode
 
-Take heed of **instructions**: "${{ steps.sanitized.outputs.text }}"
+Take heed of **instructions**: "${{ steps.sanitized.outputs.text || inputs.command }}"
 
-If these are non-empty (not ""), then you have been triggered via `/repo-assist <instructions>`. Follow the user's instructions instead of the normal scheduled workflow. Focus exclusively on those instructions. Apply all the same guidelines (read AGENTS.md, run formatters/linters/tests, be polite, use AI disclosure). Skip the weighted task selection and Task 11 reporting, and instead directly do what the user requested. If no specific instructions were provided (empty or blank), proceed with the normal scheduled workflow below.
+If these are non-empty (not ""), then you have been triggered via `/repo-assist <instructions>` (or by setting `inputs.command` in a manual `gh aw run`). Follow the user's instructions instead of the normal scheduled workflow. Focus exclusively on those instructions. Apply all the same guidelines (read AGENTS.md, run formatters/linters/tests, be polite, use AI disclosure). Skip the weighted task selection and Task 11 reporting, and instead directly do what the user requested. If no specific instructions were provided (empty or blank), proceed with the normal scheduled workflow below.
 
 Then exit  -  do not run the normal workflow after completing the instructions.