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B08 — TikZ-native authoring using C's one catalogue

Stacked draft base: feat/c07-tikz-native-six-primitives-20261031 (#39, exact parent f5e31c5); this proposal transplants B07 #37 egui workspace onto C07 and removes competing B-side syntax/help templates. Do not merge independently into main before C07 passes exact-head CI. B07 should be superseded only after B08 integration is accepted.

Functional B implementation

• Six click/drag TikZ tools (line, arrow, rectangle, circle, text/math node, cubic Bézier) use C Catalog::bundled / Catalog::generate. Toolbar, inspector, source examples, F1/hover use C ToolSpec + ParameterSpec (28 parameters, source-linked manuals).
• Standard Split shows editable source beside exact XeLaTeX PDF and a distinctly approximate guide pad. GUI themes/figure fonts independent; no CAD/CAS, PGF reimplementation, PDF inversion or opaque macro rewriting.
• Inspector selects Stealth/Latex arrow tips, text vs raw math mode, geometric parameters. Arrow requires explicitly loaded arrows.meta. Installed != project loaded; explicit preamble diff + reversible undo; no automatic MiKTeX package installation.
• B-owned marker supports exact code recognition after reopen, narrow UTF-8 SourcePatch with source revision/inverse undo, direct Source text edits invalidate stale visual Undo. Unknown user TeX/comments/macros unchanged. C/core/D APIs/files untouched.

Evidence and limitations

• 14 authoring unit tests plus B08 GUI QA, plans/insights and portable TeX fixture. Local Debian XeLaTeX manual matching-source fixture PASS (1-page PDF, raster inspected), input/PDF SHA recorded in B08 insights. This does NOT prove Rust C generator parity or GUI drag.
• B08 exact-head fmt/check/test/clippy/CI: PENDING. C07 math/escape syntax may have a malformed source token; confirm C CI rather than editing C from B.
• Physical Win10+independently installed MiKTeX, Mac M1/M4 native GUI, screenshots, dialogs, IME, HiDPI and themes: NOT_RUN. Hosted Windows Server cannot replace Win10 acceptance.

Gate and integration

Review #39 and B08 exact-head CI before merge. B07 #37 had a Rust CI rustfmt failure on radius assignment, fixed in B08. B07 should remain until integrated B08 accepted. B08 docs: plans/2026-10-31_B08_CATALOG_DRIVEN_AUTHORING.md; insights/2026-10-31_B08_CATALOG_INTEGRATION_QA.md; crates/tikzarium-app/QA_B08_LIBRARY_HELP.md. No release claim.

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Integrator update: shared N1 Rust/egui six-tool UI + C catalogue F1/hover/inspector, Split source+PDF, undo, and actual app-state→XeLaTeX proof are MERGED via #44 at main 6b0fe3551cb6ded5cf737e28a7a74326f0b4fe49, all four PR-source workflows green. #43 is historical B08 stacked on #39 and must not be merged independently into main (it would reintroduce stale C/B code). Please compare any unique B08-only screenshot/QA/help documents or new UI fixes against current main and preserve only meaningful differences in a focused follow-up, not a duplicate second authoring implementation. Real physical Win10/M1/M4 interaction NOT_RUN.

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Supersession comparison completed against exact accepted main 5f5a805005430ff26d3e3dd9c17c3ca3d7af9fa3. This historical B08 stacked draft targets old C07/#39 (f5e31c...), while accepted #44 N1 (6b0fe355...) and subsequent #50 B15 / #58 C/N2 already contain production tikz_authoring.rs + tikz_canvas.rs: the ONE C Catalog::bundled()/generator/ToolSpec, 6 native TikZ primitives, permanent Split editable source/PDF guide, Russian F1/inspector, source revision patches and undo, explicit reversible arrows.meta dependency handling, and headless egui pointer/CRLF/opaque TeX regressions. Main source and current branch were compared; compare(B08...main) is diverged 224 ahead / 9 behind, not a simple fast-forward. In particular the B08 production Rust diff must not be replayed over accepted N1/B15. Native Win10 x64 MiKTeX + physical Mac M1/M4 GUI acceptance is still NOT_RUN; new B16/B18 work remains separate draft #62 and I06 desktop #48 remains 5/6. Close as superseded / not merged, not as validation of B08's old head. Historical QA document remains accessible in this PR.