fejkdata/AGENTS.md

Rules

• Go runs only through docker compose run --rm <test|vet|fmt|build|cyclo>; the merge gate is docker build . plus CI's changelog check.
• Tests first, in their own commit; the implementation follows in the next. A re-pin of seeded output or of testdata/shipped_shape.txt is its own commit.
• A change under data/ or to the shape pin adds its CHANGELOG.md entry under Unreleased in the same PR, and so does a change to a flag, an exit code, an exported name, a fence, a builtin or the lowest Go; what is major is the README's Versioning table.
• One-line commit messages: no ticket prefix, no repo name, no authorship trailers.
• GitHub is where the project lives, so gh is the tool: merges are fast-forward only, gh pr merge --rebase where the branch is already on top of main.
• README goal 2 is gated at 7.0 on the comprehension-panel skill, and below it nothing else merges — no feature, no category, no data — bar a security fix, a dependency bump, a repair of a promise goals 3 to 5 make, and the infrastructure the round itself runs on. todo.md carries the round: the nine-seat findings run at depth 1, a PR per item it names, then the run again, until the score passes. At or above 7.0 every pull request scores with the four-seat run and answers it in one run. No merge lowers the last score its own panel recorded: the nine-seat round and the four-seat run are two ratchets, never compared with each other.
• Hard tabs. No comment by default; delete a restatement, a rationale, history, or a file preamble.
• One spelling per result: reject the other at New, and let the error name the spelling to use.
• Prose naming a source states what that source states: read the register's own field before paraphrasing it, and name the register you read before claiming none publishes a spelling.
• A README example is a json block that loads and renders as a category; readme_test.go runs every one.
• Cyclomatic complexity is gated at 14: the table-shaped dispatches (linkParent, compileTemplate, renderEdges) sit at it and stay whole; a function that would pass it is decomposed.

Decisions

In docs/decisions.md:

• GitHub is canonical, and the module path names it
• The vocabulary sits below doc.go's package clause, not in the package doc
• Options and fields share one namespace
• {a|b} stays beside nested choices
• Flags follow getopt_long
• An argument is a template by its shape, not by a flag
• An inline template skips the cycle fence
• An inline template that does not compile is misuse (exit 2), including a reference that resolves to nothing
• A padded JSON argument is rejected, not trimmed
• FakeTemplate and NewTemplate both stay
• The shipped data is embedded, not discovered
• A bare reference draws each time; a reference path is held
• Reference sigils follow the filesystem
• A change to what exists is a major; a minor only adds
• Seeded output is promised within one version
• An error is a contract by what it names, not its bytes
• Formats are checked after all data is loaded, so their errors name the category
• Raising the lowest supported Go is a major
• The format check runs on the latest Go only
• The changelog heading is the one spelling of a release; CI cuts the tag
• A --data-path override rebinds every reference to the category it replaces
• The repeat cap bounds renders, not bytes
• 64-bit targets only
• A constant zero divisor is a load error; in a string column a divisor that is not constant prints Inf
• In data, a default written out and a constant spelled as a sample are load errors
• Samples say what they emit, transforms what they do
• A record is a template seen as columns; a Go struct is the one second schema
• A struct's records follow Go's field access, and compile on first use
• A render shares one reference draw per category, per group
• A draw group name is local to its category
• The expansion hold and the render's draws are two fences
• A hold set makes its draw maps on the first read
• A category never references itself, and a record's fences run at load
• A record's column set is fixed before the first draw
• Null is a null item, not a rate
• A typed column holds one value, not composed text
• A column of one reference alone is the column it reads
• A typed column's calc is refused unless proven
• Column carries text, not a Go value
• hold names what a draw is kept in, readValue what a read drew
• One name, one meaning
• The package stays flat
• The performance gate asserts allocations, not wall-clock time
• Rows live in a TSV, the shape in JSON
• A selector is bracketed, and a dot inside it is literal
• parent names the link column and the table alike
• After a row, a path names a column or a linked table
• A selected row is fixed, not drawn, and an unnamed read beside it is refused
• A link column after a row steps up to the parent row, and a path may not end on it
• A table selects by one key column, a code, never a free-form name
• A parent row with no child row is a load error
• The choice-of-rows fence guards a data file's root, and requires string fields
• A table is a record of string columns
• The key map is built at load, the rest on first draw
• Two categories may name one TSV
• The rows of a table are alternatives
• A table never reaches its own family, by any route
• Tables carrying token cells stay small
• A path is walked once without drawing before it is walked for real
• A country's postal codes and streets are siblings under its locality
• A locale's address reads its country's geo tree, so the shipped set loads whole
• The default embed holds every Swedish postort the import can place and give a street-delivery code and a street, and the US places of 25,000 or more
• A locale's address restates its country record's format
• A postort's kommun comes from its name, its tätort or its codes, never from distance
• A highway designation is not a street, and a US postal code belongs to the place holding most of its land inside places
• --list stays a plain list of paths
• A layout is always quoted
• A title is a table under sex
• A table owns the spelling of a selector on it
• No builtin reads the clock, so a date is bounded by days, never by an age
• misc is what every locale shares
• A register's canonical spelling loses to the one its domain writes
• misc.territory is the spine, and a misc table naming a territory links to it
• A table whose register publishes no frequency draws evenly
• misc.timezone weighs a zone by the people living in it
• misc.car is one flat table, not a make linked to its models
• misc.territory names its sovereign in a column, and there is no misc.country table
• misc.loglevel is a table keyed by POSIX's keyword, carrying the code
• misc.tld keys carry the leading dot, where other tables key on a bare code
• misc.tld is a table of its own, and misc.territory.tld stays a column
• misc.territory carries a currency code, it does not link to misc.currency
• An extension may name two media types
• The Swedish ids draw Skatteverket's test series
• The US given names come from a mirror of the SSA file
• List advertises direct descents only
• Each entry point to drawCheck.hasRead says what its caller gets
• The four path walks are four loops