- Add formatResultEntryForBase + update Equals/Mod/ChangeSign so committed results
format in the active display base (e.g. HEX shows "C8", "1B0" not decimal).
- Robust per-line centering for dynamic A-F hexRow and keypad rows under display
(prevents split key borders/decorations on bottom row).
- Updated test expectation for HEX result digits.
- Enables validated cross-base flow: DEC entry, Tab to HEX, continue op, see
result in active base, Tab back converts displayed value correctly.
- style: gofmt -s all touched sources (ui_test.go, version_test.go etc.).
- ci: add lint and cross targets to Makefile.
- cross produces the 6 platform binaries expected by release.yml on v* tags.
- lint target for local parity (CI continues to use golangci-lint-action).
This is the v0.3.0 release-ready state (user-validated: 100 DEC -> Tab HEX +64 = C8 -> Tab DEC 200).
- Engine:
* EnterDigit now accepts A-F (uppercased) only for BaseHEX; decimal path now validates 0-9.
* EnterDecimalPoint ignored for non-DEC.
* currentNumericValue parses entry using current base (ParseInt base 16 for HEX, extended to BIN/OCT for robustness).
* FormatForDisplay prefers returning the raw (upper) entry string when active *and* base indicator matches (so typing 1A in HEX shows '1A', not 26).
* CycleBase now commits any active entry (parsed with old base) before switching. This makes mid-entry Tab safe and preserves CERR semantics.
- UI: added A-F/a-f key handling in Update (only when CurrentBase()==HEX). Sets pressedKey (harmless since no visual A-F buttons in tight scope).
- Tests: added 4 focused tests for hex digit acceptance, decimal ignore, mode gating, and mid-entry base switch + subsequent arithmetic.
- All existing behavior (DEC, CERR, etc.) preserved.
- Build + tests green.
This is the minimal 'keyboard only while indicator says HEX' scope requested. No visual A-F keypad buttons, no fractional hex, no changes to BIN/OCT entry.
- float64 decimal math + classic entry buffer (in-progress digits visible)
- CycleBase() with IsInteger() (epsilon) + ErrConversionNotPossible (CERR)
- FormatForDisplay() for DEC/HEX/BIN/OCT (integer formatting for non-DEC)
- Basic ops: + - * / and MOD (math.Mod)
- Equals, SetOperator, EnterDigit/DecimalPoint, ClearEntry, AllClear, ChangeSign, Backspace
- Comprehensive tests covering the critical CERR path (23/6, 1/3 + BASE) plus arithmetic and MOD
This completes the pure engine. The engine is now usable by the upcoming TUI spike. Paper trail updated.
