feat(check): add rivet check docs oracle with --format json + --strict (#540)

Enumerates every candidate path the doc scanner considered, tagging
each `loaded` / `skipped (<reason>)` / `excluded (<glob>)`. Mirrors the
existing oracle pattern (`rivet check sources` / `bidirectional` /
`gaps_json`) — narrow, mechanical, scriptable. Default output is human
text; `--format json` emits the canonical `{oracle,entries,total,
by_status}` envelope for pipeline consumers. `--strict` exits non-zero
when any entry is `skipped` (explicit `excluded` allowlist matches do
not trip strict).

Reuses the existing `load_documents_with_report` iteration verbatim
via a new `scan_documents(dir, exclude) -> Vec<ScannedDoc>` that
returns per-path detail instead of emitting stderr warnings — the
warning-printing path is left untouched, so `rivet validate`'s output
is byte-identical.

Tests: `rivet-cli/tests/docs_check.rs` covers the four fixture cases
(loaded / no-frontmatter / missing-id frontmatter / excluded-by-glob),
the strict exit-code branches in both directions, and the human-text
shape.

Closes #540.

Implements: REQ-007
Refs: REQ-004

Author: claude

rivet-cli/src/check/docs.rs

@@ -0,0 +1,166 @@
+//! `rivet check docs` — enumerate every candidate path the doc scanner
+//! considered and tag each `loaded` / `skipped (<reason>)` /
+//! `excluded (<glob>)`.
+//!
+//! Dedicated read-only oracle so the doc-scan status is queryable
+//! without a full `rivet validate` pass. Mirrors the conventions of
+//! `rivet check sources`: human-text default, `--format json` for
+//! mechanical assertions, `--strict` exits non-zero when any candidate
+//! is skipped. Explicit `excluded` allowlist matches do **not** trip
+//! `--strict` — those are user opt-in, not an oversight.
+//!
+//! JSON contract on `--format json`:
+//! ```json
+//! {
+//!   "oracle": "docs",
+//!   "entries": [
+//!     { "path": "docs/foo.md", "status": "loaded" },
+//!     { "path": "docs/bar.md", "status": "skipped",  "reason": "no YAML frontmatter" },
+//!     { "path": "docs/gen.md", "status": "excluded", "reason": "generated-*.md" }
+//!   ],
+//!   "total": 3,
+//!   "by_status": { "loaded": 1, "skipped": 1, "excluded": 1 }
+//! }
+//! ```
+
+use std::path::Path;
+
+use anyhow::{Context, Result};
+use rivet_core::document::{self, DocScanStatus};
+use serde::Serialize;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum EntryStatus {
+    Loaded,
+    Skipped,
+    Excluded,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct Entry {
+    /// Path relative to the project root, with forward slashes — stable
+    /// across platforms so JSON consumers can pattern-match without
+    /// caring whether the harness ran on Windows.
+    pub path: String,
+    pub status: EntryStatus,
+    /// For `skipped`: the human-readable reason (`"no YAML frontmatter"`
+    /// or the frontmatter parse-error message). For `excluded`: the
+    /// matching glob from `docs[].exclude`. Omitted for `loaded`.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reason: Option<String>,
+}
+
+#[derive(Debug, Default, Serialize)]
+pub struct StatusCounts {
+    pub loaded: usize,
+    pub skipped: usize,
+    pub excluded: usize,
+}
+
+#[derive(Debug, Serialize)]
+pub struct Report {
+    pub oracle: &'static str,
+    pub entries: Vec<Entry>,
+    pub total: usize,
+    pub by_status: StatusCounts,
+}
+
+/// Build the report from the project's configured `docs:` entries.
+///
+/// Iterates each `DocsEntry`, runs `scan_documents` per directory, and
+/// flattens the per-path results into a single ordered list. Paths are
+/// normalized relative to `project_root` with forward slashes.
+pub fn compute(project_root: &Path, docs: &[rivet_core::model::DocsEntry]) -> Result<Report> {
+    let mut entries = Vec::new();
+    let mut by_status = StatusCounts::default();
+
+    for entry in docs {
+        let dir = project_root.join(entry.path());
+        let scanned = document::scan_documents(&dir, entry.exclude())
+            .with_context(|| format!("scanning docs from '{}'", entry.path()))?;
+
+        for sd in scanned {
+            let (status, reason) = match sd.status {
+                DocScanStatus::Loaded => (EntryStatus::Loaded, None),
+                DocScanStatus::Skipped(r) => (EntryStatus::Skipped, Some(r)),
+                DocScanStatus::Excluded(p) => (EntryStatus::Excluded, Some(p)),
+            };
+            match status {
+                EntryStatus::Loaded => by_status.loaded += 1,
+                EntryStatus::Skipped => by_status.skipped += 1,
+                EntryStatus::Excluded => by_status.excluded += 1,
+            }
+            entries.push(Entry {
+                path: relative_display(project_root, &sd.path),
+                status,
+                reason,
+            });
+        }
+    }
+
+    let total = entries.len();
+    Ok(Report {
+        oracle: "docs",
+        entries,
+        total,
+        by_status,
+    })
+}
+
+/// Render `path` relative to `project_root` using forward slashes, so
+/// the JSON shape is stable across platforms. Falls back to the
+/// absolute path on a strip failure (canonicalization mismatch).
+fn relative_display(project_root: &Path, path: &Path) -> String {
+    let rel = path.strip_prefix(project_root).unwrap_or(path);
+    rel.to_string_lossy().replace('\\', "/")
+}
+
+/// Render the report as human-readable text: one line per entry plus a
+/// trailing summary count.
+pub fn render_text(report: &Report) -> String {
+    use std::fmt::Write;
+    let mut out = String::new();
+    if report.entries.is_empty() {
+        out.push_str("No doc candidates found (check the `docs:` block in rivet.yaml).\n");
+        return out;
+    }
+    for e in &report.entries {
+        match (&e.status, &e.reason) {
+            (EntryStatus::Loaded, _) => {
+                let _ = writeln!(out, "loaded: {}", e.path);
+            }
+            (EntryStatus::Skipped, Some(r)) => {
+                let _ = writeln!(out, "skipped: {}: {}", e.path, r);
+            }
+            (EntryStatus::Excluded, Some(p)) => {
+                let _ = writeln!(out, "excluded: {} (matched: {})", e.path, p);
+            }
+            // The reasonless skipped/excluded branches are unreachable
+            // by construction in `compute`, but render them gracefully
+            // rather than panic if anyone wires up the type by hand.
+            (EntryStatus::Skipped, None) => {
+                let _ = writeln!(out, "skipped: {}", e.path);
+            }
+            (EntryStatus::Excluded, None) => {
+                let _ = writeln!(out, "excluded: {}", e.path);
+            }
+        }
+    }
+    let _ = writeln!(out);
+    let _ = writeln!(
+        out,
+        "Total: {} (loaded: {}, skipped: {}, excluded: {})",
+        report.total, report.by_status.loaded, report.by_status.skipped, report.by_status.excluded,
+    );
+    out
+}
+
+/// Returns `true` on pass / `false` on fail (per the oracle convention).
+///
+/// Pass: every candidate is either `loaded` or explicitly `excluded`.
+/// Fail (only under `--strict`): any candidate is `skipped` — i.e. a
+/// file the scanner declined and the user did **not** allowlist.
+pub fn strict_passes(report: &Report) -> bool {
+    report.by_status.skipped == 0
+}

rivet-cli/src/check/mod.rs

@@ -21,6 +21,7 @@
 //! The JSON shape is the contract pipelines consume.
 
 pub mod bidirectional;
+pub mod docs;
 pub mod gaps_json;
 pub mod review_signoff;
 pub mod sources;

rivet-cli/src/main.rs

@@ -1871,6 +1871,26 @@ enum CheckAction {
         #[arg(short, long, default_value = "text")]
         format: String,
     },
+
+    /// Enumerate every candidate path the doc scanner considered and
+    /// tag each `loaded` / `skipped (<reason>)` / `excluded (<glob>)`.
+    /// Dedicated read-only oracle so the doc-scan status is queryable
+    /// without running a full `rivet validate` pass. `--format json`
+    /// emits the canonical `{oracle, entries, total, by_status}`
+    /// envelope; `--strict` exits non-zero when any entry is `skipped`
+    /// (explicit `excluded` allowlist matches do not trip strict).
+    Docs {
+        /// Read-only audit gate: exit non-zero if any candidate is
+        /// `skipped` (the scanner declined the file and it is not on
+        /// the `docs[].exclude` allowlist). Files that match an
+        /// `exclude:` glob are explicit opt-in and do not trip strict.
+        #[arg(long)]
+        strict: bool,
+
+        /// Output format: "text" (default) or "json".
+        #[arg(short, long, default_value = "text")]
+        format: String,
+    },
 }
 
 fn main() -> ExitCode {
@@ -2392,6 +2412,7 @@ fn run(cli: Cli) -> Result<bool> {
                 format,
             } => cmd_check_sources(&cli, *update, *apply, *strict, format),
             CheckAction::AiDefectsOpen { format } => cmd_check_ai_defects_open(&cli, format),
+            CheckAction::Docs { strict, format } => cmd_check_docs(&cli, *strict, format),
         },
         #[cfg(feature = "wasm")]
         Command::Import {
@@ -13603,6 +13624,42 @@ fn cmd_check_sources(
     Ok(firing == 0)
 }
 
+/// `rivet check docs` — enumerate the doc scanner's per-path verdicts.
+///
+/// See [`check::docs`] for the JSON contract. Iterates the project's
+/// configured `docs:` entries, runs `scan_documents` per directory,
+/// and prints the flattened enumeration. `--strict` exits non-zero
+/// when any entry is `skipped` (the scanner declined a file and the
+/// user did not allowlist it).
+fn cmd_check_docs(cli: &Cli, strict: bool, format: &str) -> Result<bool> {
+    validate_format(format, &["text", "json"])?;
+    let config_path = cli.project.join("rivet.yaml");
+    if !config_path.exists() {
+        let project_dir =
+            std::fs::canonicalize(&cli.project).unwrap_or_else(|_| cli.project.clone());
+        anyhow::bail!(
+            "no rivet.yaml found in {}\n\nTo initialize a new project, run: rivet init",
+            project_dir.display()
+        );
+    }
+    let config = rivet_core::load_project_config(&config_path)
+        .with_context(|| format!("loading {}", config_path.display()))?;
+
+    let report = check::docs::compute(&cli.project, &config.docs)?;
+
+    if format == "json" {
+        println!("{}", serde_json::to_string_pretty(&report)?);
+    } else {
+        print!("{}", check::docs::render_text(&report));
+    }
+
+    if strict {
+        Ok(check::docs::strict_passes(&report))
+    } else {
+        Ok(true)
+    }
+}
+
 struct ProjectContext {
     config: ProjectConfig,
     store: Store,