instructions: chains of packages - stack-dev writes ## Kette, stack-close names the next link (#205)

Files changed:
- CHANGES.md
- VERSION
- instructions/dev/issue-tracking.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-dev/SKILL.md
- instructions/dev/stack-mode.md

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

instructions/dev/stack-dev/SKILL.md

@@ -41,13 +41,22 @@ are split that way.
    asked in the chat and stays a question in the body until it is answered; it is never settled
    by a guess.
 
+   **A session that yields more than one package with an order gives each of them a
+   `## Kette` section** (`instructions/dev/issue-tracking.md` § Chains): the chain's name, the
+   predecessor, the successor, nothing else. When a package is inserted into an existing chain,
+   taken out of it or moved within it, the neighbours' sections are corrected in the same
+   session, and the changelog comment names it. The order stays a planning decision; a real
+   dependency also gets `status/blocked`.
+
 4. **Name the version part.** Apply the drop-in test in `instructions/dev/version-parts.md`
    and write the result into the body. Whether a change is a drop-in replacement has no
    mechanical guard, so it is decided here, not at the bump. A change that crosses the
    compatibility boundary goes to the user with what breaks, what an instance has to do about
    it, and the alternatives, before the body can be ready (version-parts.md step 4).
 
-5. **End the phase at a ready body.** Check the body against
+5. **End the phase at a ready body.** First, for every package of a chain this session touched,
+   read both neighbours' `## Kette` sections and confirm that predecessor and successor point at
+   each other; repair a one-sided pointer before going on. Then check the body against
    `instructions/dev/issue-tracking.md` § Ready to build. If it fails, say which point is open
    and stay in this phase. If it passes, recommend one of two ways on, and stop: