Fix: Import merge for project and 10 other safe-output types

[Copilot]

Workflows importing safe-output configurations from shared files (e.g., shared/campaign.md) were silently dropping 11 safe-output types due to missing merge logic.

Problem

# shared/campaign.md
safe-outputs:
  create-project-status-update:
    max: 1

When imported, the configuration was parsed but never merged, leaving the tool unavailable at runtime.

Changes

Added merge logic for 11 types in mergeSafeOutputConfig:

• CreateProjectStatusUpdates (primary issue)
• CreateProjects, CopyProjects, UpdateDiscussions
• LinkSubIssue, HideComment, DispatchWorkflow
• AssignToUser, AutofixCodeScanningAlert, MarkPullRequestAsReadyForReview
• MissingData

Reordered merge blocks to match SafeOutputsConfig struct field order for maintainability.

Added tests verifying import behavior for all affected types.

Result

Compiled workflows now include all safe-output types from imports:

- {"create_issue":{"max":1},"update_project":{"max":100}}
+ {"create_issue":{"max":1},"create_project_status_update":{"max":1},"update_project":{"max":100}}

Original prompt

Investigate why tool to create project status update is missing: https://github.com/githubnext/gh-aw/actions/runs/21486733288/job/61898442164
Recorded missing tool: create_project_status_update
Reason: Need to create a project status update for GitHub Projects v2 with status (ON_TRACK), start_date, and markdown body. Current safeoutputs-update_project only supports adding items and updating fields.
Alternatives: Manually create the status update via GitHub UI, or use gh CLI if a status update API is available: gh api graphql -f query='...'
✓ Message 12 (missing_tool) completed successfully

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