chore: adopt compass for project tracking

Three workstreams -- the query verbs, the corpus and how it is mounted, and the
docs that explain both. Each can go stale independently, which is what the
workstream boundary is for: a change to a verb obligates the vignettes, a change
to the corpus obligates NEWS.

All six open issues now carry ws/ and type/ labels, applied additively so #36
kept its existing kodor/, severity/, south-guide and verdict/ labels. The
generated board is pinned as issue #68.

.roborev.toml carries review guidelines composed from a shared baseline, the R
package overlay, and this project's own conventions read out of CLAUDE.md: the
ensure_session-then-dbGetQuery order, the tbl_df-with-provenance return
contract, coerce_govid_input at the boundary, the two SQL layers, no arrow, and
withr as tests-only.

The .gitignore change is load-bearing. pkgdown output made docs/ ignored, which
would have left every compass file untracked and unable to travel to another
machine. Git cannot re-include anything beneath an excluded directory, so the
rule had to list children instead. That forced an anchoring change: a bare
"docs/" matches at any depth, "/docs/*" only at the root, so the fixture corpus
docs directory needed an explicit rule to stay excluded as before.

.gitignore

@@ -4,7 +4,17 @@
 .Ruserdata
 *.Rproj
 inst/doc
-docs/
+# pkgdown output. Listed as children rather than `docs/` so compass's
+# docs/pm/ and docs/decisions/ can be re-included -- git cannot re-include
+# anything beneath an excluded directory.
+#
+# Note the anchoring change this forces: a bare `docs/` matches a directory of
+# that name at ANY depth, while `/docs/*` matches only at the repo root. The
+# fixture corpus's own docs/ therefore needs its own rule to stay excluded.
+/docs/*
+!/docs/pm/
+!/docs/decisions/
+inst/extdata/fixture_corpus/docs/
 /doc/
 /Meta/
 .DS_Store
@@ -12,3 +22,6 @@ docs/
 
 # SDD working artifacts (ledger, briefs, review packages) — plans/ stays tracked
 .superpowers/sdd/
+.compass-cache/
+# roborev snapshots
+/.roborev/

.roborev.toml

@@ -0,0 +1,56 @@
+# roborev configuration, initialised by compass.
+# Reviews are queued to a background daemon -- they never block a commit.
+
+post_commit_review = 'commit'
+excluded_commit_patterns = ['WIP', 'chore:', 'docs:', 'Merge ']
+
+review_guidelines = '''
+# --- compass:begin (generated -- edit the sources, not this) ---
+- Prefer returning new values to mutating arguments in place. A function that edits
+  its caller's object is a bug waiting for a second caller.
+- Validate at system boundaries -- user input, API responses, file contents, config.
+  Fail fast with a message naming the field and the file.
+- Never swallow an error. Handle it or let it propagate; a bare catch that continues
+  is worse than a crash.
+- No hardcoded secrets, tokens, or credentials, and no secrets in log output or error
+  messages.
+- Parameterise every query. String-built SQL is a defect even when the input looks safe.
+- Keep functions under roughly 50 lines and files under roughly 400. Flag nesting
+  deeper than four levels.
+- No magic numbers or hardcoded paths -- name them as constants or read them from config.
+- New behaviour needs a test. A bug fix needs a test that fails without the fix.
+- Use the native pipe `|>`, not magrittr `%>%`.
+- snake_case for objects and functions; UPPER_SNAKE for constants. Never use `.` as a
+  word separator in a function name -- it collides with S3 dispatch.
+- Validate arguments at the top of exported functions with `stopifnot()` or an explicit
+  check, and say which argument was wrong.
+- Never `setDT()`, `set()`, or otherwise modify by reference a data.table the caller
+  still owns. `as.data.table()` copies; use it.
+- Prefer `vapply()` to `sapply()` -- `sapply()` silently returns a list when the type
+  varies, which turns a type error into a downstream mystery.
+- Use `seq_len(n)` / `seq_along(x)`, never `1:n`, which iterates backwards when n is 0.
+- Compare strings with `==` only after checking for NA; use `identical()` for scalars
+  where NA would be wrong.
+- Do not call `library()` inside package or module files; attach packages in scripts and
+  test helpers only.
+- Namespace-qualify calls into other packages (`stats::sd`) in code that is sourced.
+- Every exported function needs roxygen with `@param` for each argument (type, meaning,
+  and why the default is what it is) and `@return`. Add `@examples` for exported API.
+- Declare dependencies in DESCRIPTION. Prefer base R or an existing dependency over
+  adding a new one; a package with zero hard deps is worth keeping that way.
+- Signal errors with `stop()` carrying a condition class, so callers can catch the kind
+  rather than matching on message text.
+- Keep internals internal. Export only what a user needs; an accidentally exported
+  helper becomes an API you have to keep.
+- Tests use testthat edition 3. Each test is self-sufficient -- no reliance on state
+  left by an earlier test or on a fixture built elsewhere in the file.
+- Prefer duplication in tests over a helper that hides what is being asserted.
+- Every verb calls .ensure_session() first, then queries via DBI::dbGetQuery().
+- A verb's return value is always a tbl_df carrying a provenance attribute.
+- govid inputs always go through .coerce_govid_input(); it accepts a character vector or a data frame.
+- SQL has two layers: view definitions are numbered .sql files in inst/sql/ registered by .register_views(); query construction is inline sprintf() in R. Add a view as a file; build a query in R.
+- No arrow dependency -- DuckDB reads parquet natively.
+- withr is Suggests-only and must appear in tests alone.
+- Tests must pass offline against the bundled fixture; tests/testthat/setup.R sets USCOGDATA_URL for that.
+# --- compass:end ---
+'''

docs/decisions/README.md

@@ -0,0 +1,12 @@
+# Decisions
+
+One file per decision, numbered and immutable. A decision that changes is superseded
+by a new record, never edited in place — the old reasoning is the point.
+
+The table below is **generated** by `compass:decide`. Do not hand-edit it.
+
+<!-- compass:begin decisions -->
+| # | Date | Decision | Status |
+|---|---|---|---|
+| — | — | *No decisions recorded yet.* | — |
+<!-- compass:end decisions -->

docs/pm/JOURNAL.md

@@ -0,0 +1,14 @@
+# Project journal
+
+Append-only, newest first. **Entries are never edited** — the value of this file is
+that it records what was believed at the time, including the parts that turned out
+wrong. Where things stand *today* is in `STATUS.md`, which is generated.
+
+Four lines per entry. The analysis belongs in the issue or the decision record; this
+file carries the reasoning and the pointers.
+
+- **Why** — the driver. The one line git cannot reconstruct later.
+- **Obligates** — issues this change created elsewhere. Numbers, not prose.
+- **Refs** — commits, issues, decision records.
+
+---

docs/pm/STATUS.md

@@ -0,0 +1,73 @@
+# Project status
+
+> Between the compass markers is generated. Edit the sources, not this.
+
+<!-- compass:begin -->
+<!-- compass:board -->
+
+## Where this stands
+
+uscogdata is at 0.4.0 and its public surface is settled: the query verbs, the cohort
+predicates added in this release, and the provenance contract every verb returns.
+
+The six open issues split cleanly. Two are API work carried out of the #9 review pass
+and deliberately deferred there rather than fixed in that branch. Three concern the
+corpus layer, and the largest of them, partition-level caching, was named the single
+highest-leverage change on the remote path before being deferred. One, the
+data-correction intake, is a decision rather than a task: it was parked during the
+0.3.0 design and it gates the API announcement, because without it the corpus cannot
+make the "traceable and correctable" claim that most distinguishes it from Census's
+own files.
+
+Nothing here is blocked on anything else, so the ordering is a judgement about value
+rather than a dependency graph.
+
+## Ready to work on next
+
+- **#34** cog_revenue() offers expenditure recipes as suggestions: scope the candidate query by category_type · `ws/api` — nothing is blocking it; something is currently wrong
+- **#36** n_units_reporting is category-conditional and cannot be read as a response rate · `ws/corpus` — nothing is blocking it; owed work from an earlier change
+- **#2** Extend population data to be households as an alternate spending denominator · `ws/corpus` — nothing is blocking it
+- **#33** Decompose .build_suggestions() (106 lines) into named helpers · `ws/api` — nothing is blocking it
+- **#52** Release 11/11: design the data-correction intake (deferred; gates the API announcement) · `ws/corpus` — nothing is blocking it
+- **#64** Partition-level caching: R/cache.R is still a stub, and the remote path pays for it every session · `ws/corpus` — nothing is blocking it
+
+## Workstreams
+
+| Stream | Commits since | Open | Debt | Owes docs |
+|---|---|---|---|---|
+| Query verbs and results | 77 | 2 | 0 | no |
+| Corpus, mirror, provenance | 39 | 4 | 1 | no |
+| Vignettes and guides | 34 | 0 | 0 | **yes** |
+
+## CI
+
+![R-CMD-check](https://gitea.civilytics.org/Civilytics/uscogdata/actions/workflows/ci.yml/badge.svg?branch=main)
+![Mirror to GitHub](https://gitea.civilytics.org/Civilytics/uscogdata/actions/workflows/mirror-github.yml/badge.svg?branch=main)
+
+<details>
+<summary>Dependency graph and detail</summary>
+
+```mermaid
+graph TD
+  I34["#34 cog_revenue() offers expenditure recipes as sug…"]
+  I36["#36 n_units_reporting is category-conditional and c…"]
+  I2["#2 Extend population data to be households as an a…"]
+  I33["#33 Decompose .build_suggestions() (106 lines) into…"]
+  I52["#52 Release 11/11: design the data-correction intak…"]
+  I64["#64 Partition-level caching: R/cache.R is still a s…"]
+  class I34 ready;
+  class I36 ready;
+  class I2 ready;
+  class I33 ready;
+  class I52 ready;
+  class I64 ready;
+  classDef ready fill:#dafbe1,stroke:#2da44e;
+```
+
+- Marker: `none` (no journal entry yet)
+- Commits since: 164
+- Open issues: 6
+
+</details>
+
+<!-- compass:end -->

docs/pm/compass.toml

@@ -0,0 +1,44 @@
+[project]
+name  = "uscogdata"
+forge = "Civilytics/uscogdata"
+
+# Three strands that go stale independently: what the verbs return, what the
+# corpus is and how it is mounted, and how both are explained to a reader.
+
+[[workstream]]
+id    = "api"
+title = "Query verbs and results"
+paths = [
+  "R/revenue.R", "R/spending.R", "R/balances.R", "R/peers.R", "R/search.R",
+  "R/categories.R", "R/recipes.R", "R/rollup.R", "R/explain.R", "R/basket.R",
+  "R/suggestions.R", "R/suppression.R", "R/complete.R", "R/cohort.R",
+  "R/basis.R", "R/adjust.R", "R/pagination.R",
+]
+docs  = ["vignettes/*.Rmd", "README.md"]
+
+[[workstream]]
+id    = "corpus"
+title = "Corpus, mirror, provenance"
+paths = [
+  "R/manifest.R", "R/mirror.R", "R/cache.R", "R/session.R", "R/provenance.R",
+  "R/coverage.R", "R/config.R", "R/views.R", "R/series_breaks.R",
+  "R/balance_caveats.R", "R/zzz.R", "data-raw/**", "inst/sql/**",
+]
+docs  = ["vignettes/*.Rmd", "NEWS.md"]
+
+[[workstream]]
+id    = "docs"
+title = "Vignettes and guides"
+paths = ["vignettes/**", "README.md", "_pkgdown.yml", "NEWS.md"]
+docs  = []
+
+[roborev]
+project_guidelines = [
+  "Every verb calls .ensure_session() first, then queries via DBI::dbGetQuery().",
+  "A verb's return value is always a tbl_df carrying a provenance attribute.",
+  "govid inputs always go through .coerce_govid_input(); it accepts a character vector or a data frame.",
+  "SQL has two layers: view definitions are numbered .sql files in inst/sql/ registered by .register_views(); query construction is inline sprintf() in R. Add a view as a file; build a query in R.",
+  "No arrow dependency -- DuckDB reads parquet natively.",
+  "withr is Suggests-only and must appear in tests alone.",
+  "Tests must pass offline against the bundled fixture; tests/testthat/setup.R sets USCOGDATA_URL for that.",
+]