v0.3.0

• Fix: Lay Track drag now starts and ends on a station when pressed on its building (snap to the station's tile), so dragging from one station to another works as in the original
• Feature: city names and free map labels (seas) are written above the map, station names when zoomed in; vector text, hidden when too far out, overlap-free
• Feature: the editor's tool panel uses the original bp*.imb art (height, paint, fill, trees, territories, add, bulldoze, overview) with the message strip bpmisc, scaled to the window, with click areas over the art (Kind::Hotspot in rt2-ui)
• Feature: Map Options pages Players (add/delete, persona, mandatory/optional, human/computer/either, cash), Player Pool, Managers, Engines, Ports and Robbers, with the player summary of the header kept as the original's editor does
• Feature: New Map > From Image (PCX heights with height scale 1..2000) and Remove Territory in Territory Setup
• RE: Map Options byte maps (players pool 0x574c68 +0x530..0x533, header summary 0x567c88/0x567ca0, player pool 0x567d40, managers 0x570638, engines 0x570667, port rows 0x57023b, robbers 0x573da2, robbery level 0x5704a8) and the PCX import (0x469bc0, 0x469670) documented in docs/formats/map-gam.md section 10
• Feature: scenario effect 233 floods a territory like the original (0x4c8a30 and the mode 3 water fill of 0x490490: trains, stations, track, buildings, rivers and roads cleared, water painted, corners set to the level).
• Feature: scenario effects 299/302 demolish stations and effect 189 removes the company's stations and track (building_destroy 0x40adb0 -> station_remove 0x4bf4e0, 0x437ab0 with destroy).
• Fix: demolishing a farm repaints the fields with the overlay lists as loaded (FieldDemolition identical to the original).
• Fix: a demolished building's cargo pile clears the lots' industry and frees those not in a car (0x40adb0).
• RE: the AI stop ratio 0x57951c is a run-time global that outlives a turn; ai_replan_train out of the AI turn (station removal) reads it.
• Docs: fidelity scoreboard 131/131 identical with the new prepared cases Flood, ConfStations and Deactivate (rt2-savepatch --add-rule, prepare_rare.py recipes, ADV_ADVHOOKPY in advance_gdb.py).

v0.2.0

• Feature: map and scenario editor (main menu Editor): new/open/save .MP2 maps, height, paint, fill, trees, territories, add buildings/industries/cities/rivers/roads, bulldozer, undo, Map Options and a scenario rules editor with live condition validation
• RE: editor tool routines ported from the executable (elevation brushes 0x426480, trees 0x429fc0, fill 0x490490, mixed paint 0x48cc00, rivers 0x429ea0, places 0x42f630, territories 0x4c8470) and the saver's map overview 0x477040, byte-identical to the original's .MP2 files
• Docs: editor screens L1..L13 and the editor chapter of the UI notes
• RE: Rare events in the fidelity scoreboard: prepared saves (re/scripts/wine/prepare_rare.py, rt2-savepatch) for train crashes, thefts and arrests, the board firing an AI chairman, creditor liquidation, AI stock trading and the AI's on-track engine swap; all identical to the original.
• Fix: Train crashes (0x4ce730), thefts (0x4ceaa0) with the nearest-town factor, arrests and the yearly theft-rate recovery now follow the original; a crashed train is removed when its wreck time ends.
• Fix: The annual review now fires the chairman and liquidates bankrupt companies (0x438170), and computer persons trade stocks (0x4a8af0).
• Fix: The AI's engine replacement on a train on the track (0x4d4e90) and the cargo lot of a removed car (0x4d0fa0).
• Fix: Town growth reads the live building count and a demolished building's list links are cleared (diverged with other RNG seeds at the year end).

v0.1.0

• RE: headless Ghidra export of every non-thunk function as decompiled C with our names (re/scripts/export_decomp.sh, re/db/decomp) for parallel grep-based analysis.
• Feature: PK2 archive reader with filename-hash lookup and the rt2-extract tool.
• Feature: LNG string-table parser (last definition wins, named ;t<NAME>_0 tables).
• RE: PK2 filename hash, archive load order and precedence recovered from the executable.
• Docs: development plan, file-format specs for PK2 and LNG, project README.
• RE: PK2 contents classified: LAD sprite format (8-bit indexed, per-row RLE, layered), palette banks, RGB palettes, IMB layouts and raw PCM audio.
• Docs: game rules, formulas and data tables extracted from the manual, strategy guide and editor notes (docs/reference/manual-rules.md).
• RE: sprite palette rule recovered: a LAD record's second header word selects the bank PALT%04d.PAL (loader at 0x4f8b80, palette reader at 0x4f8ed0); palette words are XRGB1555.
• RE: LAD layout corrected (records of image groups with frame maps); all 1990 sprite banks parse to the last byte.
• Feature: LAD sprite and palette-bank parsers with RGBA conversion in rt2-formats, and the rt2-sprite tool that renders an entry to PNG.
• Docs: docs/formats/lad.md with the sprite layout, palette rule and source addresses.
• Feature: rt2-oracle differential-testing harness: a PE32 loader plus Unicorn emulation that runs single functions of the original executable (cdecl/stdcall/thiscall, IAT stubs that name any OS import touched, .data snapshot/restore, x87 ST0 readout).
• RE: the PK2 name-hash case fold (0x4f0d70) matches rt2_formats::pk2::fold_name_byte for all 256 byte values, checked against the original in the emulator.
• Docs: docs/oracle.md explains how to write a differential test.
• RE: maps/*.MAP and games/*.GAM are uncompressed: header with map size at 0x231, 10-byte tile records (ground, trees, structure, track, territory) from 0xB2D7 and an i16 corner heightmap of (w+1)*(h+1); renders reproduce Britain, Chesapeake and the other 31 maps, see docs/formats/map-gam.md and re/scripts/mapgam.py.
• RE: automatic first-pass classification of all 2945 functions Ghidra finds in RT2_PLAT.EXE (re/coverage.toml: 680 classified, 262 lib, 4 sim candidates), produced by re/scripts/dump_program.sh and re/scripts/classify.py.
• Feature: .MAP/.GAM parser (rt2_formats::map): header, tile records and corner elevations for all 31 maps and both saves.
• Feature: rt2-render (wgpu terrain mesh, 2:1 isometric camera) and rt2-viewer, which opens an original map with pan, zoom and 90-degree rotation, or writes a screenshot with --screenshot.
• RE: calendar recovered from the executable: 12 months of 28 days, minute resolution, absolute minutes ((((y*12+m)*28+d-29)*24+h)*60)+min (0x4a4950, 0x4a4990, 0x4a4a30), checked against the original in the emulator for 20000 dates.
• RE: game speed is an index 0..10 (default 3) into the table 0, 0.3, 0.6, 1, 1.7, 2.1, 3, 5, 8, 12, 18; game minutes per frame = ftol(table * ms * 3.2), so one day lasts 450 ms at speed 3 (0x46c650, 0x536508).
• RE: main loop and tick structure documented in docs/spec/time.md: frame gate every >100 ms (0x404e30), sim_advance (0x4a5cb0) with week end on days 7/14/21/28, month end on day 28 and year end on 28 December, all at 23:59, plus the scenario-event trigger kinds fired around each.
• RE: the game RNG is an ANSI C LCG (state 0x55d2c0, s*0x41c64e6d+0x3039, output (s>>16)&0x7fff) with an inclusive-range wrapper (0x4f0660), a stateless seed-hash variant (0x4f06f0) and the MSVC CRT rand (0x51c137) for audio, UI and session ids; all four match the original in 20000+ emulated calls each (docs/spec/rng.md).
• RE: first simulation functions moved to spec/verified in re/coverage.toml (22 of 31 classified simulation functions), 73 symbols in re/symbols.toml.
• Docs: docs/spec/time.md and docs/spec/rng.md, the first P0 simulation specs, with open questions (x87 precision, entity list identities, CRT rand in train code).
• RE: cargo table found in the executable's .data (0x5404b1, 46 records of 33 bytes: price, delivery days, distance sensitivity, first year, town/city cut-off years, demand per house, storage-upgrade bit); prices are multiplied by 1.4 at start-up, so the effective base price differs from the manual (passengers 56000 raw, 78400 effective).
• RE: delivery revenue formula recovered and verified bit-exact against the original (0x4bf760, 8000 random deliveries): distance factor X = 1 - s + s*1.4*d/(15 + 0.5*(year-1800)) applied twice, a time penalty 0.3 + 0.7*(allowed - elapsed)/allowed, demand-level price table 0.5..1.4 (expert), manager/event effects, economy state, human/computer sliders and a progressive cut above $80000 per load.
• RE: manager, event and territory effect multiplier (0x46b480) verified: product of (1 + level/100) over global, company, person and territory levels with a 0.01 floor.
• RE: industry production decoded: a table of 53 types x 4 output slots (0x541ae0) gives primary rates, converter ratios, bonus inputs (fertilizer 0.5/0.25, grain 0.5) and demand weights; lots are created from 483840 / (rate * effects * economy) minutes (faster after 1930, 1950 and 1970), at most 50 waiting per slot; rate and input-list rebuild verified against the original.
• RE: cargo waits in the industry's pile, not in the station; stations load the oldest lot in their catchment, price levels 0..9 come from demand weight over a delivery counter that decays by 0.94 per month, and the economic state (0x46a010, every six months) scales production (0.84..1.16) and revenue (0.8..1.2).
• RE: code and manual disagree on cargo economy details: $2000 station fee per loaded car at each end (manual $1000), passenger-bonus buildings pay the station owner 10/15/5/15/25% (manual 20/30/10/20/40%) and several cargo prices and cut-off years differ; see docs/spec/cargo.md section 11.
• Docs: docs/spec/cargo.md, the cargo economy spec, with the cargo and industry tables extracted from the executable, differential tests in crates/rt2-oracle/tests/cargo.rs and open questions (x87 precision changes about 10% of revenues, commit-path functions untested).
• RE: formato completo do .MAP/.GAM decodificado a partir do carregador 0x477a60 e do gravador 0x477540: blocos globais, tiles, elevacao, 15 pools de slots (estruturas, estacoes, pessoas, empresas, objetos, pecas de trilho, trens, lugares, territorios...), extras de trens e regras de cenario; data/hora e game_seed localizados (o estado do RNG nao e salvo)
• Feature: rt2_formats::map::Save le data e hora do jogo, game_seed, lugares (cidades) com coordenadas, empresas, pessoas, estacoes, trens e regras de cenario; os 33 .MAP/.GAM originais sao consumidos ate o ultimo byte
• RE: simulação de trens em docs/spec/trains.md: tabela de 66 locomotivas (0x53cec0) e 175 tipos de veículo (0x53ddb8) no .data, curva de velocidade 0x4cfea0 (reproduz a tabela A-1 do guia), rampa por trecho 0x4284e0, passo de aceleração 0x4d0400, probabilidade e consequências de quebra/acidente (0x4cf030, 0x4cf390), custos mensais de combustível e manutenção (0x4d4390)
• RE: o crt_rand_range(0, 3) dos trens (0x4d0400, 0x4d2360, 0x4d29e0) só escolhe som; quebras usam o RNG do jogo; /nowreck multiplica a chance por 1e-4 em vez de zerar
• RE: oráculo tests/trains.rs: rampa, curva de velocidade, passo de aceleração e chance de quebra idênticos ao original em 70 000 casos aleatórios
• Docs: preços do apêndice do guia que divergem do executável (GP9, SD45, E60CP, Eurostar, TGVs) anotados em docs/spec/trains.md
• RE: precisão x87 medida no original sob Wine (winedbg --gdb + gdb): thread principal em FPCW 0x27F (53 bits) no porteiro de quadros e em sim_advance; sandbox e sondas em re/scripts/wine/ (docs/dynamic-analysis.md)
• Feature: novo crate rt2-sim, nucleo de simulacao deterministico: RNG do jogo (LCG e hash), calendario e velocidade, multiplicador de efeitos, receita de entrega, taxa de producao e reconstrucao de entradas das industrias, curva de velocidade, aceleracao, chance de quebra e custos mensais dos trens, camada de comandos (Command, World::apply) e carregador em tempo de execucao das tabelas do EXE
• Improved: os testes diferenciais do oraculo (sim_time_rng, cargo, trains) agora exercitam as funcoes publicas do rt2-sim em vez de copias locais, e conferem o carregador de tabelas contra a memoria emulada
• Docs: docs/spec/time.md registra a divergencia intencional do clone (quadro nominal fixo de 100 ms)
• RE: bitmap fonts: font%s.dat is only a name (hash) selecting one of 10 built-in definitions (0x4f24c0) over LAD banks copp6/8/10/12/14/24.imb, scri11, fran13, haet46, htra46; glyph = record ch-0x20, group 0 alpha mask, group 1 shadow; metrics in docs/formats/font.md
• RE: glyph RLE (0x4fff00) has tokens beyond plain LAD: 0x80-0x9f darken the destination, 0xa0-0xbf are alpha runs over the text colour
• RE: .win UI layouts (46 files) decoded from the loader 0x507600: 65-byte window struct, 10 control types with action id, rectangle, font and sprite bank; see docs/formats/ui.md
• Feature: bitmap font reader (rt2_formats::font) and the rt2-font tool that renders text to PNG
• Feature: UI layout parser (rt2_formats::ui) and the rt2-ui tool that draws a window's geometry with its sprites
• Docs: docs/formats/font.md and docs/formats/ui.md
• RE: advance_save.py avança um save N dias no original (Wine+gdb, sem GUI) via carga do menu 0x479710, sim_advance 0x4a5cb0 e gravador 0x477540; determinístico byte a byte com a mesma semente (docs/dynamic-analysis.md seção 5)
• RE: especificacao de trilho, pontes, terraplenagem e estacoes em docs/spec/terrain-track.md: custo por tile (0x463520), formas de aresta validas (0x5365e8), pontes por tipo (0x53ce60), custo de estacao e captacao (0x407030, raios 2/...