[github-actions]

tools/drift-check found pool entries whose canonical copy moved upstream; tools/promote --refresh --exclude dp jax re-promoted them. Review the ledger diff, not just the lecture text: a refresh re-resolves every source, so an entry whose other copies went stale can change shape.

	before	after
interim: true ledger entries	24	24
lectures re-copied		1

Run: https://github.com/QuantEcon/lectures/actions/runs/41014911436. The branch is force-pushed from main on every run that still needs a refresh, so this PR always shows the current delta.

 lectures/markov_jump_lq.md | 131 ++++++++++++++++++++++++---------------------
 sync/ledger.yml            |  86 ++++++++++++++---------------
 2 files changed, 113 insertions(+), 104 deletions(-)