feat(integrations): add omp support (#3107)

* feat(integrations): add omp support

* Update updated_at timestamp

* refactor(integrations): delegate omp build_exec_args to base, register in issue templates

Inherit MarkdownIntegration.build_exec_args so omp picks up shared CLI
contract changes (requires_cli gating, extra-args ordering, --model
handling) automatically; only specialize the --mode json flag.

Also add Oh My Pi / omp to the issue-template agent lists so
test_issue_template_agent_lists_match_runtime_integrations passes.

* fix(integrations): use --print + positional prompt for omp argv

OMP's CLI parser treats `-p`/`--print` as a boolean (one-shot mode)
and consumes the prompt as a positional message; the previous
inherited `-p <prompt>` shape worked by accident only because `-p`
ignores its next token. Build the argv explicitly with flags first
and the prompt as a trailing positional, matching upstream args.ts.

.github/ISSUE_TEMPLATE/agent_request.yml

@@ -8,7 +8,7 @@ body:
       value: |
         Thanks for requesting a new agent! Before submitting, please check if the agent is already supported.
         
-        **Currently supported agents**: Amp, Antigravity, Auggie CLI, Claude Code, Cline, CodeBuddy, Codex CLI, Cursor, Devin for Terminal, Firebender, Forge, Gemini CLI, GitHub Copilot, Goose, Hermes Agent, IBM Bob, iFlow CLI, Junie, Kilo Code, Kimi Code, Kiro CLI, Lingma, Mistral Vibe, opencode, Pi Coding Agent, Qoder CLI, Qwen Code, Roo Code, RovoDev ACLI, SHAI, Tabnine CLI, Trae, Windsurf, ZCode, Zed
+        **Currently supported agents**: Amp, Antigravity, Auggie CLI, Claude Code, Cline, CodeBuddy, Codex CLI, Cursor, Devin for Terminal, Firebender, Forge, Gemini CLI, GitHub Copilot, Goose, Hermes Agent, IBM Bob, iFlow CLI, Junie, Kilo Code, Kimi Code, Kiro CLI, Lingma, Mistral Vibe, Oh My Pi, opencode, Pi Coding Agent, Qoder CLI, Qwen Code, Roo Code, RovoDev ACLI, SHAI, Tabnine CLI, Trae, Windsurf, ZCode, Zed
 
   - type: input
     id: agent-name

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -85,6 +85,7 @@ body:
         - Kiro CLI
         - Lingma
         - Mistral Vibe
+        - Oh My Pi
         - opencode
         - Pi Coding Agent
         - Qoder CLI

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -79,6 +79,7 @@ body:
         - Kiro CLI
         - Lingma
         - Mistral Vibe
+        - Oh My Pi
         - opencode
         - Pi Coding Agent
         - Qoder CLI