#102 — explore view toggle (CTE ⇄ model) + tests.html unit-test viewer

[cmbays]

Summary

Epic #99 V3. Closes #102

• dag.html — CTE ⇄ model view toggle. The toolbar gains a two-arm toggle. The lineage view stays the boot view; the CTE arm renders the selected model's CTE DAG with the same vendored Cytoscape core + cytoscape-dagre layout the lineage view uses (no new asset). The carrier (explore-dag-data) gains a cte_dags map — full model node id → the same DagPayload the report renders for that model (role-classified nodes, join-typed edges; the build_payload reuse seam, parsed once in Rust). A new first-party engine (templates/explore-cte.js, banner-pinned cute-dbt explore CTE engine v1) owns the toggle + CTE render.
• tests.html — unit-test viewer. The page now renders the unit-test card through a shared askama partial (templates/partials/test-card.html) extracted from report.html and included by both pages — not a fork. A new light engine (templates/explore-tests.js, cute-dbt explore tests viewer v1) fills the card from the embedded cute-dbt-data payload: selector optgrouped by model, Given/Expected grids off the Rust FixtureTable POD (NULL/absent cell vocabulary preserved), sql-format code blocks, external-fixture provenance notes, and index-row jump buttons. The page embeds no Cytoscape, no dagre, no Mermaid, no DataTables, no jQuery and passes the zero-egress gate on its own.
• BDD: features/explore_view_toggle.feature + tests/steps/explore_view_toggle.rs; feature-count mirror bumped 17 → 18 in BOTH ci.yml and lefthook.yml atomically (verified 18 in tree).

CTE-view binding decision (documented per the slice brief)

The CTE view binds to the highlighted model — the same in-page selection that click / fuzzy-search-select drives (a Space focus commit implies a highlight, so a committed model is always viewable). With no highlight the CTE arm is disabled (the hint says so); while the CTE view is active a search-select retargets it in place, and a cleared highlight falls back to the lineage view. Chrome + selection persist: the lineage Cytoscape instance is never rebuilt — only cy.resize() runs after un-hiding, so pan/zoom/highlight survive the round trip (proven headlessly). The CTE instance rebuilds only on model retarget (the cyto-dag.js model-switch precedent). data-selected-model stays Space-commit-only — explore-cte.js never writes it (pinned by an asset_embed test).

Fail-open contract

An uncompiled model (dbt parse) ships no cte_dags entry; the client renders a labeled degraded CTE view (" has no compiled SQL in this manifest (dbt parse) — run dbt compile…"), never an error. A compiled CTE-less model renders the "no CTE structure" sparse state. PreflightError keeps its four variants.

Discovery answer — what extracted cleanly vs stayed report-specific

report.html's unit-test rendering is split across static skeleton markup and JS-driven payload rendering (interaction.js):

• Extracted cleanly (the shared partial): the entire static skeleton — the .test-section card (test selector, scope toggle, badges row, description, details body) plus the .panel-row Given/Expected panel pair. It contains zero askama expressions, so one partial serves both template contexts verbatim. The include is output-preserving: askama strips the included file's final newline, so the parent restores the separating blank line — all three report goldens regenerate byte-identical (verified, and gated by example-report-check).
• Stayed report-specific (deliberately NOT extracted): everything dynamic in interaction.js — selector population tied to the model-select/scope state, diff toggles/tints (explore is full-manifest: no changed-set, no PR diff), DataTables enhancement, the YAML drawer, copy buttons, settings wiring. Per the lane boundary, interaction.js and report.css are untouched; tests.html gets a NEW explore-specific explore-tests.js (no jQuery/DataTables) and styles the shared markup with explore-local CSS. The partial's scope toggle (Updated only / All tests) is meaningless on a full-manifest page — it is hidden via explore-page CSS, not forked out of the shared markup.
• Also reused rather than re-implemented: the FixtureTable POD cell contract ({display, key}, diff: show authored cell values — split cell IR into display/equality axes + POD-render fixture tables #138) and the cte_dags map reuses DagPayload directly (no parallel type).

Invariants held

• Zero-egress per page: resource-ref lint + headless file:// network-block gates pass for dag.html and tests.html (and the report).
• No root_path/home-path leaks in regenerated pages (rg "root_path|/Users/|/home/" over examples/explore/ → clean); synthetic-only fixtures (no new fixtures).
• Single crate; no inward imports; PreflightError = 4 variants; one selectedModel write site (pinned).
• templates/interaction.js and templates/report.css untouched (sibling lane on feature: design-2 integration PR-5 — rich hover cards: ref()/Expected model pills, format-badge fixture reconstruction, overrides badge, info tips #202).

Gate evidence (run directly in the worktree — lefthook skips in fresh worktrees)

Gate	Result
cargo fmt --all --check	exit 0
cargo clippy --all-targets --locked -- -D warnings	exit 0 (judged by exit code)
cargo nextest run --all-targets --locked	1143 passed, 49 skipped (ignored headless)
cargo test --test bdd	132 scenarios / 836 steps passed (4 new)
cargo test --test headless_zero_egress -- --ignored	7 passed (incl. the 2 new #102 tests + per-page explore gates)
cargo test --test headless_toggle -- --ignored	42 passed
RUSTDOCFLAGS="-D warnings" cargo doc --no-deps --document-private-items --locked	exit 0
cargo deny check	exit 0
Report goldens (jaffle-shop, playground, diff-showcase)	regenerated → byte-identical to committed (the partial extraction is output-preserving)
Explore goldens	regenerated + committed; double-render byte-identical; git diff -- examples/ audited (only examples/explore/* changed)
insta	intended-only (nextest green, no pending snapshots)
crap4rs v0.4.0 (CI-pinned, --config crap4rs.toml --coverage lcov.info)	1677 functions, 0 above threshold, worst 23.0 — PASS
feature-count mirror	18 in tree == ci.yml == lefthook.yml
baseline-required-grep awk mirror	exit 0

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 4e1e2183-10af-4bd8-8d9b-a58e2b92f792

📥 Commits

Reviewing files that changed from the base of the PR and between 15e308a and d794d6a.

📒 Files selected for processing (20)

• .github/workflows/ci.yml
• examples/explore/dag.html
• examples/explore/tests.html
• features/explore_view_toggle.feature
• lefthook.yml
• src/adapters/asset_embed.rs
• src/adapters/explore.rs
• src/adapters/render.rs
• templates/explore-cte.js
• templates/explore-dag.html
• templates/explore-lineage.js
• templates/explore-tests.html
• templates/explore-tests.js
• templates/partials/test-card.html
• templates/report.html
• tests/headless_zero_egress.rs
• tests/steps/explore_full_manifest.rs
• tests/steps/explore_view_toggle.rs
• tests/steps/mod.rs
• tests/steps/world.rs

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• Create PR with unit tests
• Commit unit tests in branch adapters-102-explore-view-toggle

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[ghost]

Ready to review this PR? Stage has broken it down into 9 individual chapters for you:

	Title
1	Enable comparison for core DAG types
2	Extract shared unit-test card partial
3	Wire CTE and test data through adapters
4	Implement CTE view toggle in dag.html
5	Implement unit-test viewer in tests.html
6	Embed JS assets and add integrity tests
7	Update examples with new view features
8	Add BDD and headless tests for view toggle
9	Bump feature count in CI and Lefthook

_{Chapters generated by Stage for commit d794d6a on Jun 11, 2026 5:38am UTC.}

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