[help wanted] Clojure's quote and discard forms use the shared inert-region walk (CONTRIBUTING slice 8a) #449

Claim it in this issue first. Size: S. Depends on: nothing; #380 (the shared walk, @LaimaWu) and #349 (Clojure support, @tag-und-nacht) are both on main. Language: Clojure.

The problem, in user terms

Code inside a quoted or discarded form is data, not a call (Clojure '(foo), #_(foo), (comment (foo))), and Elixir quote bodies are the same idea. Elixir's rule goes through the one shared walk; Clojure still has its own copy:

ripwire src --no-cache --callers=inInertRegion
<callers ... of="inInertRegion" defs="1" count="1" ...><s t="fn" n="elixirInert" p="ingest_elixir.h:330" sites_at="ingest_elixir.h:332"/></callers>
ripwire src --no-cache --callers=clojureInert
<callers ... of="clojureInert" defs="1" count="1" ...><s t="fn" n="clojureKeepCapture" p="ingest_clojure.h:82" sites_at="ingest_clojure.h:84"/></callers>

(built from daf1ccba.) clojureInert (src/ingest_clojure.h) walks the ancestors itself with its own loop and is marked "Temporary inert-form filter: CONTRIBUTING slice 8a moves it onto the shared mechanism". The shared one is inInertRegion in src/ingest_inert.h: a language gives a callback that classifies one ancestor as Inert, Live (a hole that re-enters code) or None.

Files to touch

• src/ingest_clojure.h: clojureInert (and its one caller clojureKeepCapture) become a inInertRegion( node, [&]( TSNode ancestor, TSNode ) { … } ) call returning InertBoundary::Inert for quoting_lit, syn_quoting_lit, dis_expr and a list_lit whose head is comment (clojureListHead). Delete the loop.
• src/ingest_inert.h: read only; do not widen it for Clojure. If a callback cannot say what you need, that is the finding to put in the PR.
• test/clojurecheck.sh and test/clojurefix/: the existing arms (quoted, commented, comment-call, comment-holder and quoted-holder in core.clj) already cover the four forms; add the nested cases below.

Red-first fixture and gate arm

• This slice is byte-identical on today's fixtures; the arm is the known gap the move exposes. A syntax-quote has holes (in a backquoted (a ~(b)) the ~ re-enters code and b IS a call), and today's filter treats the whole syntax-quote as inert. With the shared walk you can give unquoting_lit / unquote_splicing_lit a Live arm. Do not: keep behaviour identical and add a known-gap arm (test/fieldnarrowcheck.sh shows the form) asserting today's answer for a defn whose body is a backquoted (a ~(b)), naming the follow-up that flips it. If you want to flip it, make it its own PR with an --intended row.
• near misses: (comment …) as a head only (not a symbol named comment-x); a #_ discard before a def removes that def's captures but not its neighbours; a quote inside a defmacro.

Acceptance

• bash test/langidentitycheck.sh BASE HEAD --langs=clj,ex,py,go,rs,cpp --repo=ex:<your clone of an Elixir repository>: every language SAME on the clj fixtures and the repository.
• ripwire src --callers=clojureInert answers no definition; ripwire . --quality-delta=origin/main..HEAD gates 0; CONTRIBUTING definition of done.

Not in scope

Clojure's keyword tables (clojureDefinitionShape, the special-forms list), which are slice 5a (#355); any Elixir change.

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