feat: stack development in three phases - stack-dev (design), stack-build, stack-close, handed over through tracker states (#168)

stack-build and stack-close carry disable-model-invocation, so each phase change is
the operator's slash command; no skill offers a mid-session /model or /effort switch.
Mode rules and the phase table move to instructions/dev/stack-mode.md, publish and CI
waiting to instructions/dev/publish-and-ci.md, the ready definition to issue-tracking.md.

Files changed:
- AGENTS.md
- CHANGES.md
- DEVELOPMENT.md
- README.md
- VERSION
- docs/model-and-effort-selection.md
- instructions/CONTRACT.md
- instructions/dev/commonplace-kb.md
- instructions/dev/dev-setup.md
- instructions/dev/doc-pull-through.md
- instructions/dev/issue-tracking.md
- instructions/dev/publish-and-ci.md
- instructions/dev/stack-build/SKILL.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-dev/SKILL.md
- instructions/dev/stack-mode.md
- instructions/dev/testing-conventions.md
- instructions/dev/version-parts.md
- tools/chemenu/commands/git_publish.py
- tools/chemenu/tests/test_git_publish.py
- tools/chemenu/tests/test_instructions_cmd.py

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

instructions/dev/doc-pull-through.md

@@ -18,8 +18,8 @@ way; see Gitea #89 for one).
 
 ## When to run
 
-Before `tools/wikitool docs verify`/`publish` in a `stack-dev` session that changed behaviour -
-`stack-dev` step 5 sends you here. Read the table below and update every row whose surface you
+Before `tools/wikitool docs verify`/`publish` in a build session that changed behaviour -
+`stack-build` step 5 sends you here. Read the table below and update every row whose surface you
 touched; a row that does not apply needs no action.
 
 ## Steps
@@ -76,7 +76,7 @@ touched; a row that does not apply needs no action.
 - **Unsure whether a `docs/` page's reasoning moved?** Read it. A `docs/` page carries no
   normative sentence and nothing verifies it by construction (AGENTS.md § File naming), so an
   unsure guess defaults to reading the page rather than skipping the question -
-  [`stack-close`](stack-close/SKILL.md) step 3 asks it again at the end of the session as a
+  [`stack-close`](stack-close/SKILL.md) step 3 asks it again in the closing phase as a
   backstop, not as the only time it is asked.
 - **The surface is a whole new stage, collection, or gate?** The table's rows are the steady
   state; a new row-worthy category is itself a change to this instruction - add the row here
@@ -84,7 +84,7 @@ touched; a row that does not apply needs no action.
 
 ## Scope
 
-Applies to `stack-dev` sessions only - wiki content changes have their own provenance and
+Applies to stack-development sessions only - wiki content changes have their own provenance and
 cross-reference rules (`kb/CONTRACT.md`, `wiki-manage`), which already pull the relevant pages
 through as part of the normal skill. Not a replacement for `stack-close` step 3, which re-asks
-the `docs/`-staleness question after publish as the second, session-final check.
+the `docs/`-staleness question after the green CI run as the second, final check.