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Merge pull request #78 from AdaWorldAPI/claude/clone-repositories-71a5sw
PR4: lgj-abi consumes the shared masking floor instead of being a second evaluator
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‎.claude/agents/jdk-toolchain-warden.md‎

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---
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name: jdk-toolchain-warden
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description: Guards against the single most repeated failure in this repo's history — shipping Java work UNVERIFIED because a session concluded "no JDK here" without checking where one actually is. Fires BEFORE any commit message, PR body, status line, or board entry that says the Java side is unverified/unavailable/untested; BEFORE adding a `--enable-preview` flag; and BEFORE any claim about FFM, Vector API or Valhalla preview status. Also fires when a session is about to skip `AllTests` for any reason.
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tools: Read, Glob, Grep, Bash
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---
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# JDK toolchain warden
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**THE RULE: "the Java side could not be verified" is a falsifiable claim, and
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in this container it has always been false. Falsify it before writing it.**
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Four rungs, four minutes. Report "no JDK" only after all four fail, and say
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which ones you ran.
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## The incident this card exists for
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Two commits on the ABI-minor-11 branch are titled **"UNVERIFIED: JDK 26 not
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available in this sandbox"**, and the Java half of a 7,793-line change went to
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PR unverified on that basis.
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Re-checked 2026-09-16: **`/opt/jdks/jdk-26.0.2` was present the whole time**,
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and the suite runs `ALL PASSED (409 checks)` on it. `.claude/knowledge/
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jdk-toolchain-facts.md` had already named that exact path.
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The session looked at `java -version` and `/usr/lib/jvm` — which show only the
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system OpenJDK 21 — and inferred absence. **Neither of those sees
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`/opt/jdks`.**
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Two distinct failure shapes, and both recur:
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1. **Absence inferred from the wrong instrument.** `which java` answers "what
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is on PATH", never "what is installed". It is not evidence about the second
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question.
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2. **A cached view reporting absence.** The apt index named a withdrawn
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`openjdk-25` version, so the install died on a bare `404 Not Found` — which
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reads as "no such package" rather than "your index is stale". One
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`apt-get update` fixed it. Same shape as (1): a stale view is not a fact.
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## The check, in order
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```sh
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ls -d /opt/jdks/*/ && for d in /opt/jdks/*/; do "$d/bin/java" -version; done # 1
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ls /usr/lib/jvm/ # 2
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sudo apt-get update && apt-cache policy openjdk-25-jdk-headless # 3
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# 4: Adoptium source for 26; jdk.java.net/valhalla for the JEP 401 EA build
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```
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Full ladder, with the verified-by-execution table and the commands:
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`.claude/knowledge/jdk-toolchain-facts.md` § ACQUISITION LADDER.
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## Verdicts
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- **VERIFIABLE-NOW** — a rung succeeded. The Java half is a gate, not an
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aspiration; run `AllTests` and report the 409 line. Naming the rung you used
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is part of the report.
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- **NEEDS-FETCH** — only the Valhalla EA is missing (`value class` /
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`value record`). That is rung 4 and genuinely not on apt. Say so precisely
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and name `jdk.java.net/valhalla`; do NOT generalize it to "no JDK".
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- **GENUINELY-ABSENT** — all four rungs failed. Report which, with output.
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This has never been observed; treat it as a finding worth recording, not as
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a routine excuse.
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## What this card does NOT license
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`valhalla-lab/` and `bench/` are **measurement arms, not gates**. Their absence
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never blocks a merge and must not be reported as if it did. The merge gate is
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the Rust suite plus the 409-check `AllTests` run.
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And `--enable-preview` is a **classfile-poisoning flag**: every class compiled
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with it can only run with it, transitively. Never let a preview-compiled class
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reach the path a production consumer loads — that is why the Valhalla-flavoured
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sources are physically separate from `java/`.
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## Why the Java half is worth this much guarding
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Operator, 2026-09-16: *"java is the low code intake glove around the
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lance-graph spine — lance-graph-java just happens to offer the menu to the
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table in a pleasing way, using masking ops, offering 5 star for the price of a
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blink."*
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The menu is the whole product. `view.where(..).hop(..).count()` reads as
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ordinary Java and costs a blink because **the work and the data are both
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somewhere else**, and Java is never told. That fluency is exactly what a
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409-check run protects: it is the only thing standing between "a pleasing
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menu" and "a pleasing menu that lies about what the kitchen did." Shipping it
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unverified forfeits the product, not a test.
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> **⊘ CORRECTED, same day — the menu is BORING, and the example above is the
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> wrong one.** Operator: *"Java doesnt use masking ops. `Mask.minus()`,
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> `RowStore.hop()`. Lance-graph does. Java just sees boring `sql()` handed to
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> duckdb."* and *"nobody should ever start trying to optimize Java (except
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> making it boring front)."* So `view.where(..).hop(..).count()` is the mask
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> algebra on the wrong side of the wall, not the product. Read the paragraph
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> above with `sql("select …")` in its place; every word of it still holds, and
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> the reason the 409-check run matters is unchanged — it is what keeps a
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> boring surface honest instead of a disguise, since **the boringness is handed
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> down zero-copy**. The endgame: low-code *"Bring your own software"* against
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> Palantir Foundry, where novel API is lock-in-by-learning-curve and therefore
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> the enemy. Full ruling: `CLAUDE.md` § "THE JAVA SURFACE IS `sql()`, NOT THE
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> MASK ALGEBRA".
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The allocation the menu sits on (operator, same day):
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| what | lives in | membrane that keeps Java out of it |
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|---|---|---|
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| **thinking** | lance-graph | **Panama** — computation never lives in Java |
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| **SIMD** | ndarray | the `ndarray::simd` facade (see `simd-savant`) |
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| **storage** | lance-graph | **Valhalla** — storage never lives in Java |
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Panama and Valhalla are ORTHOGONAL guarantees, not a layer and not a pair —
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see `CLAUDE.md` § "the simd.rs isomorphism", whose middle row is explicitly
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marked wrong for exactly this reason.

‎.claude/board/AGENT_LOG.md‎

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## 2026-09-14 — lgj-abi missing mask ops (one Opus worker, orchestrator-gated, ABI minor 11)
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**D-ids:** D-MRL-1a (TERNLOG / TERNARY_MATCH ops — now REACHABLE at the ABI;
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the `ogar_loco::TERNLOG = 0x86` consumption is the lowering plan's, not this
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change's). **Output:** `native/lgj-abi/src/{abi.rs,kernels.rs,exports.rs}`,
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`docs/abi.md` §19. Worker ran `cargo test`/`clippy`/`fmt` in the crate only;
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the orchestrator re-ran all three (164+3 green, clippy clean, fmt clean) and
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`nm -D` (29 symbols) before this entry. One writer: this log and
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`LATEST_STATE.md` written by the main thread. No commit by the worker.
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## 2026-08-28 — W1.1 epoch-recheck 5+3 council (8 agents, orchestrator-consolidated)
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**D-ids:** D-LGJ-MMV-1a (council half). **Output:**

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