fix(#4264): wire both TDD dispatch backends to phase.tdd-applicable (#4284)

gsd-core/workflows/execute-phase.md

@@ -677,6 +677,8 @@ increases monotonically across waves. `{status}` is `complete` (success),
 
    **Executor routing (#1689/#3370).** Per plan, run `gsd-core/workflows/execute-phase/steps/per-plan-executor-routing.md` to set `EXECUTOR_TYPE` for `subagent_type="{EXECUTOR_TYPE}"` below.
 
+   **TDD-applicability resolution (#4266/#4272).** Run `gsd-core/workflows/execute-phase/steps/tdd-applicability-resolution.md`.
+
    **Worktree mode** (`USE_WORKTREES` and `USE_WORKTREES_FOR_PLAN` not `false`):
 
    Before spawning, capture the current HEAD:
@@ -757,7 +759,7 @@ increases monotonically across waves. `{status}` is `complete` (success),
        - `~/.claude/gsd-core/workflows/execute-plan.md`
        - `~/.claude/gsd-core/templates/summary.md`
        - `~/.claude/gsd-core/references/checkpoints.md`
-       ${TDD_APPLICABLE ? '- `~/.claude/gsd-core/references/tdd.md`' : ''}  # #3990: only when this dispatch is TDD (plan type: tdd, a tdd="true" task, or TDD_MODE=true)
+       ${TDD_APPLICABLE ? '- `~/.claude/gsd-core/references/tdd.md`' : ''}  # #3990/#4265: type: tdd, tdd="true", or workflow.tdd_mode
        - `~/.claude/gsd-core/references/worktree-path-safety.md`
        ${CONTEXT_WINDOW < 200000 ? '' : '- `~/.claude/gsd-core/references/executor-examples.md`'}
        </execution_context>