fix(plan-level): ensure_plan_branch before write_plan (worktree invariant) - #200

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JINJA002: 'declare_root.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if declare_root.output.error is defined %}', '{% if declare_root.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'commit_and_push_manifest.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if commit_and_push_manifest.output.error is defined %}', '{% if commit_and_push_manifest.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'preflight_ensure_branch.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if preflight_ensure_branch.output.error is defined %}', '{% if preflight_ensure_branch.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'preflight_apex_state.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if preflight_apex_state.output.error is defined %}', '{% if preflight_apex_state.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'build_worklist.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if build_worklist.output.error is defined %}', '{% if build_worklist.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'evidence_floor_check.output.error_message' has can_omit_when_null=true and is not guarded. Wrap in '{% if evidence_floor_check.output.error_message is defined %}', '{% if evidence_floor_check.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'evidence_floor_check.output.error_code' has can_omit_when_null=true and is not guarded. Wrap in '{% if evidence_floor_check.output.error_code is defined %}', '{% if evidence_floor_check.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'open_evidence_pr.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if open_evidence_pr.output.error is defined %}', '{% if open_evidence_pr.output is defined %}', or pipe through '| default(...)'.

JINJA002: 'compose_addendum.output.error' has can_omit_when_null=true and is not guarded. Wrap in '{% if compose_addendum.output.error is defined %}', '{% if compose_addendum.output is defined %}', or pipe through '| default(...)'.