Add assign-to-user safe output type (#5340)

* Initial plan

* Add assign-to-user safe output type for assigning users to issues

- Add JSON schema definition for assign-to-user in main_workflow_schema.json
- Add AssignToUserConfig struct and parsing logic
- Create pkg/workflow/assign_to_user.go for job builder
- Create pkg/workflow/js/assign_to_user.cjs JavaScript implementation
- Add assign_to_user tool to safe_outputs_tools.json
- Register script and embed directive in scripts.go and js.go
- Add to generateFilteredToolsJSON(), generateSafeOutputsConfig(), HasSafeOutputsEnabled()
- Add to compiler_jobs.go for job building
- Add to safe_output_validation_config.go for validation
- Update tests in safe_outputs_tools_test.go and safe_output_validation_config_test.go
- Update documentation in docs/src/content/docs/reference/safe-outputs.md

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

* Fix default max value in parseBaseSafeOutputConfig call

Change from 0 to 1 to match documented default behavior.

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

* Refactor parseAssignToUserConfig to use ParseListJobConfig

Reduce code duplication and improve consistency with other similar
parsing functions.

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

* Add test-assign-to-user.md workflow for assign_to_user safe output

This adds a test agentic workflow that exercises the new assign-to-user
safe output type.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Add changeset [skip-ci]

* Update dev.md to use assign-to-user for mrjf on workflow dispatch

Changes the dev workflow from using assign-to-agent (Copilot) to
assign-to-user (mrjf) for issue assignment.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Fix assign-to-user job not being invoked on workflow_dispatch

The assign_to_user job requires `target: "*"` when triggered via
workflow_dispatch since there's no issue context. Without this, the
job condition included `(github.event.issue.number)` which evaluates
to falsy on workflow_dispatch events.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Fix resolveTarget to handle issue_number field for target="*"

When target="*", the resolveTarget function now checks for
item.issue_number in addition to item.item_number and
item.pull_request_number. This fixes assign_to_user failing when
the agent output uses the standard issue_number field.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Update dev.md to pick any open unassigned issue

Changed from searching for specific "[deps]" issues to searching for
any open issue that isn't already assigned to mrjf. This makes the
workflow more general and useful for testing assign-to-user.

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* Fix: Update setup-node action version and streamline numberField assignment in safe_output_helpers

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Peli de Halleux <pelikhan@users.noreply.github.com>

Author: 4 people