[harshitsinghbhandari]

Summary\n- add canonical PR state and display status for GitHub draft PRs\n- derive draft display status while keeping CI failure dominant\n- route draft PR SCM observations through the PR ladder without review/merge statuses\n\n## Tests\n- go test ./...\n- go build ./...

[Copilot]

Pull request overview

Adds first-class support for GitHub draft pull requests in the canonical PR lifecycle, including a new derived display status (draft) while preserving CI failure as the dominant signal.

Changes:

• Introduces domain.PRDraft and a new derived domain.StatusDraft, plus status-derivation rules for draft PRs.
• Routes draft SCM observations through the existing open-PR decision ladder, but short-circuits review/merge states for drafts.
• Extends unit tests across lifecycle manager, decision logic, and status derivation to cover draft behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
backend/internal/lifecycle/manager.go	Handles PRDraft SCM observations by running the open-PR ladder with Draft=true.
backend/internal/lifecycle/manager_test.go	Adds ApplySCMObservation coverage for draft PR scenarios (draft vs ci_failed).
backend/internal/domain/status.go	Adds StatusDraft and draft-specific status derivation (CI failure still wins).
backend/internal/domain/status_test.go	Adds draft status-derivation test cases.
backend/internal/domain/lifecycle.go	Adds PRDraft canonical PR state.
backend/internal/domain/decide/types.go	Extends OpenPRInput with a Draft flag and updates documentation.
backend/internal/domain/decide/decide.go	Updates open-PR ladder to emit PRDraft + StatusDraft when Draft=true (CI failure still dominates).
backend/internal/domain/decide/decide_test.go	Adds decision tests for draft behavior and PRState emission.

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