Pass project URL from frontmatter to safe output handlers as default

[Copilot]

Safe outputs update-project and create-project-status-update now use the project.url from frontmatter as a default when messages don't specify an explicit project field.

Changes

• Compiler (pkg/workflow/compiler_safe_outputs_steps.go): Added GH_AW_PROJECT_URL environment variable to project handler manager step when project.url is configured in frontmatter

• JavaScript handlers: Modified update_project.cjs and create_project_status_update.cjs to check process.env.GH_AW_PROJECT_URL when message doesn't specify project field

• Precedence: Explicit project field in safe output message always overrides frontmatter default

Example

Frontmatter:

project:
  url: "https://github.com/orgs/myorg/projects/123"

safe-outputs:
  update-project:
    max: 5

Safe output message (project URL omitted):

{
  "type": "update_project",
  "content_type": "draft_issue",
  "draft_title": "New item",
  "fields": {"status": "Todo"}
}

The handler automatically uses https://github.com/orgs/myorg/projects/123 from frontmatter. If the message includes "project": "https://github.com/orgs/other/projects/456", that explicit value takes precedence.

Backward compatible—workflows without frontmatter project configuration or with explicit message-level project fields behave identically.

Original prompt

Update the compiler to pass the value of the frontmatter field "project" to the safe-outputs step that handles project related safe outout entries.

The safe output like update-project or create-project-status-update should use this value by default (target=context). The user can override this if target=*.

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