[i-shutov]

C/N2 — consolidated, source-first library catalogue + honest project-import evidence

Exact base main: ab5705d4dd7e3dcefd3ef6ddfd695f6d0ee4dfd1 (N1 #44, C #49/#51/#55 already merged). Exact PR HEAD: 7114d2d9bb3ce622dd7f1523e53f72082557d446. C branch absorbs the independently green late-import change from C #61 as a second-parent merge, not by replaying old #39. The source diff to main contains 15 C-owned paths only: tikzarium-extensions, extensions/, docs/EXTENSIONS.md, C plans/ and insights/. No B UI/A build/D/E/F files changed.

Functional code, not a CAD scene or TeX parser

• Versioned extensions/primitives/catalog-v1.toml: the six N1 native TikZ primitives and their original Russian parameter help are preserved. Four PGF/TikZ libraries (arrows.meta, positioning, calc, fit) gain stable IDs, native syntax, package/library/engine requirements, complete original XeLaTeX example, Russian effect/warnings/interactions, primary manual section/URL; unverified minimum PGF version is UNKNOWN, not invented.
• Additive Rust Catalog::libraries / Catalog::library(name) and project_imports::capabilities_for_library(...). Keep INSTALLED, PROJECT_LOADED, ENGINE_COMPATIBLE, TOOL_IMPLEMENTED, HELP_AVAILABLE separate. Package presence never implies project import, actual TeX compilation, visual editing or tool coverage. For arrows.meta the narrow arrow generator exists; no positioning/calc/fit visual editor is implied. Lua-only graphdrawing remains outside XeLaTeX.
• Existing targeted literal \\usepackage / \\usetikzlibrary recognition, declaration_sites, source revision/range checks, connect/disconnect plans and inverse Undo patches retained. Newly combined source evidence: a possible late document-body \\usetikzlibrary{calc} or external \\input/\\include gives missing requirements UNKNOWN, keeps previously confirmed preamble declaration sites, refuses unsafe edits with reason. Comments/escaped control sequences are not fabricated as imports. No silent install or engine switch.
• New independent n2-library-fixture Rust generator for four actual XeLaTeX examples; source-level negative/refusal/CRLF/undo tests, plus one cross-feature test proving the library panel reports late body-side calc UNKNOWN even when INSTALLED=CONFIRMED. Six original tools and help regression tests remain included.
• B API handoff on feat(B10–B15): TikZ-native egui tools, Esc/Undo and C/N2 source evidence links #50, D fixture/rejection test contract available in this PR; independent help E and source F retain ownership. The interface for visible diff/confirmation/Undo is B-owned and is not implemented by this change.

Actual QA and evidence boundary

• fix(C/N2): mark late TeX library imports UNKNOWN, preserve source authority #61's former separate HEAD e66ed1f...: Native CI, D QA, N1 app→XeLaTeX, font integrity and hosted Windows Server MiKTeX all SUCCESS (runs 41213489854, 41213489872, 41213489866, 41213489861, 41213489864). This is not the consolidated HEAD result.
• feat(C/N2): unified PGF/TikZ library catalogue and safe import evidence #58's former HEAD 0ad8978...: Native CI, N1 and hosted XeLaTeX SUCCESS; independent D QA 41211862002 initially FAILED an unrelated B-owned Linux Poppler timeout assertion, and a targeted failed-job rerun was initiated. That old result is not a PASS for this head.
• Exact combined HEAD 7114d2d9bb3ce622dd7f1523e53f72082557d446: 5/5 hosted workflows SUCCESS. Native CI 3/3, D QA 7/7 including three OS Rust fmt/tests/Clippy and actual XeLaTeX CLI, N1 application→TikZ→XeLaTeX, hosted MiKTeX 25.12 Windows Server 2022, font/glyph integrity. The new C combined regression passed in Ubuntu, hosted Windows Server and macOS Rust job logs. This does not establish physical Win10/M1/M4 GUI acceptance.
• Physical Windows 10 x64 with externally installed MiKTeX, physical Mac M1/M4 ARM64 external XeLaTeX and GUI screenshot/gesture acceptance: NOT_RUN. A PDF compilation is not a GUI visual edit PASS.

Merge/review sequencing

Review and gate this consolidated #58 as the single C/N2 code+tests+docs+plans/insights unit. Independent C #61 is contained in the verified PR #58 ancestry and was closed without merge as superseded, avoiding a duplicate integration. No merge to main by C claimed.

[i-shutov]

Integration gate at 0ad8978a0b094c35a81d3cbc756e128b7e29585b: D QA 41211862002, Ubuntu job 124568348394 FAIL in Rust full workspace tests (35/36 tikzarium-app tests PASS). Exact failure: pdf_navigation::tests::poppler_worker_kills_hung_process_and_reports_not_checked, assertion at crates/tikzarium-app/src/pdf_navigation.rs:246: error.contains("timed out") false. This is an unmodified B/Poppler test, not the new C catalogue, but it remains a mandatory gate; do not merge #58 on this SHA or reduce the acceptance assertion. First capture the actual error with the existing variable (e.g. assert diagnostic "unexpected Poppler error: {error:?}") and determine why subprocess spawn/monitoring returned before 150ms. Windows/macOS Rust passed at this HEAD, N1 and fonts passed, but Linux D QA is red. Keep C-only ownership; coordinate a separate B/integrator fix if the underlying issue is in Poppler test/runtime. No false cross-host PASS.

[i-shutov]

C/N2 coordination from independent PR #61 (base main ab5705d): external XeLaTeX accepts \usetikzlibrary{calc} after \begin{document}. Main's preamble-only inspect currently reports a false Absent. #61 adds a bounded post-begin ambiguity guard: direct preamble sites stay Confirmed; absent libs become Unknown, auto connect/disconnect refuse. Your #58 change to project_imports.rs is additive at imports/capabilities_for_library/supported-list, while #61 inserts lexical helpers and post-begin check; no type change, but both PRs touch that C file. Please reconcile after first merge and rerun exact-head Rust CI. New C-owned XeLaTeX fixture in #61; physical Win10/M1/M4 still NOT_RUN.

[i-shutov]

C/N2 consolidation checkpoint (2026-10-31): this PR now contains both the original four-library declarative catalogue and source-authority fix from C PR #61, preserved in a two-parent branch merge on current main ab5705d4dd7e3dcefd3ef6ddfd695f6d0ee4dfd1. Exact combined HEAD 7114d2d9bb3ce622dd7f1523e53f72082557d446. GitHub compare against that main: 15 C-owned paths only; no A/B/D/E/F files. Added a combined Rust integration regression: late body-side \\usetikzlibrary{calc} must yield library-panel PROJECT_LOADED=UNKNOWN even with INSTALLED=CONFIRMED, retain confirmed preamble tikz evidence, and refuse an invisible source edit. Original six tool/help records remain unchanged. Prior D QA failure on old #58 HEAD was a B-owned Poppler timeout assertion, not C catalogue; a failed-job rerun was requested but cannot be inherited as this HEAD's PASS. New CI is queued: https://github.com/i-shutov/tikzarium/actions/runs/41215112434 ; separate D and XeLaTeX jobs also required. Retain draft until exact-head green. No physical Win10/M1/M4 acceptance.

[i-shutov]

Exact combined HEAD QA verified — 7114d2d9bb3ce622dd7f1523e53f72082557d446, main ab5705d4dd7e3dcefd3ef6ddfd695f6d0ee4dfd1. All five hosted workflows finished SUCCESS on this exact SHA: native Rust CI 3/3, D QA 7/7 including Windows Server/macOS/Ubuntu Rust fmt+tests+Clippy and actual XeLaTeX CLI, N1 actual application→TikZ→external XeLaTeX, font/glyph PDF gate, and distinct MiKTeX 25.12 hosted Windows Server 2022. Independently inspected Ubuntu, Windows Server and macOS Rust job logs: new late_body_import_remains_unknown_in_shared_library_panel test PASS on all three hosts, 7/7 shared library tests. PR diff vs main: 15 C-only paths, no B/A/D/E/F modifications, mergeable. Old #58 D QA Poppler timeout was an unmodified B test; targeted old-head rerun also finished SUCCESS, but current exact-head D QA independently passed and is the acceptance evidence. Review-ready code, not a released/physically accepted GUI: physical Win10+user MiKTeX, M1/M4, B library-panel UX/manual confirmation remain NOT_RUN. No main merge performed by C.