Version Jira transition read-only planner reports

[StatPan]

Goal

Make gira jira transition --dry-run --json a stable read-only planner contract so adapters can consume Jira transition reachability without mistaking it for approval to mutate Jira.

Scope

• Add a stable jira-transition-plan/v1 schema version to Jira transition plan reports.
• Preserve explicit read-only evidence fields and keep approval evidence absent by design.
• Ensure CLI JSON output adds the schema version even when tests inject report builders.
• Update the agent-kernel adapter contract to treat Jira transition as schema-versioned read-only planning, not shared apply approval evidence.

Acceptance Criteria

• Jira transition JSON includes schema_version: jira-transition-plan/v1, dry_run: true, and read_only: true.
• Jira transition JSON does not include approval evidence.
• Direct transition, manual-admin, missing-transition, and unmapped-status decisions remain compatible.
• Adapter docs no longer list Jira transition as a remaining shared approval-envelope gap.

Expected Delivery

Open one implementation PR with focused tests for core planner reports and CLI JSON output. Merge after checks pass.

Parent: #521

base_branch: main
base_source: branch_policy.default
branch_policy_mode: github-flow
target: default
work_branch: issue-629-version-jira-transition-read-only-planner-reports

[StatPan]

Finish Receipt

• Finished at: 2026-05-23T07:17:16Z
• Ticket: Version Jira transition read-only planner reports #629 status=Done state=closed
• Linked PR: feat: Version Jira transition read-only planner reports #630 state=MERGED merged=true
• Checks: passed total=11 passing=11 pending=0 failing=0
• Review: unknown
• Evidence: closing_reference,branch_binding,checks
• AI Delivery Telemetry: not_required
• Label changes: add=status:done remove=status:in-review
• Warnings: missing_acceptance_criteria
• Next: ticket is done