Feature/Fix: Define lineage promotion gates

Sources/CodexBarCore/Generated/CodexParserHash.generated.swift

@@ -1,5 +1,5 @@
 // Generated by Scripts/regenerate-codex-parser-hash.sh. Do not edit by hand.
 
 enum CodexParserHash {
-    static let value = "cdef6eb9658a43e2"
+    static let value = "84c52421265e9fc8"
 }

Sources/CodexBarCore/Providers/Codex/CodexLineageDiscovery.swift

@@ -0,0 +1,175 @@
+import Foundation
+
+/// Expands an already bounded rollout-file selection with only the ancestors its documents reference.
+enum CodexLineageDiscovery {
+    struct Report: Equatable, Sendable {
+        let documents: [CodexLineageLedger.Document]
+        let referencedParentDocumentCount: Int
+        let unresolvedParents: Set<CodexLineageLedger.ParentIdentity>
+    }
+
+    static func discover(
+        includedFiles: [URL],
+        roots: [URL],
+        checkCancellation: CostUsageScanner.CancellationCheck? = nil) throws -> Report
+    {
+        var locator = ParentFileLocator(roots: roots, checkCancellation: checkCancellation)
+        var documents: [CodexLineageLedger.Document] = []
+        var knownIDs: Set<ScopedIdentity> = []
+        var seenPaths: Set<String> = []
+        var pendingParentIDs: [ScopedIdentity] = []
+        var unresolvedParents: Set<CodexLineageLedger.ParentIdentity> = []
+        var referencedParentDocumentCount = 0
+
+        func remember(_ document: CodexLineageLedger.Document) {
+            documents.append(document)
+            knownIDs.insert(.init(scopeID: document.scopeID, sessionID: Self.canonicalSessionID(document.ownerID)))
+            if let metadataSessionID = Self.nonEmpty(document.metadataSessionID) {
+                knownIDs.insert(.init(
+                    scopeID: document.scopeID,
+                    sessionID: Self.canonicalSessionID(metadataSessionID)))
+            }
+            if let parentSessionID = Self.nonEmpty(document.parentSessionID) {
+                pendingParentIDs.append(.init(
+                    scopeID: document.scopeID,
+                    sessionID: Self.canonicalSessionID(parentSessionID)))
+            }
+        }
+
+        for fileURL in includedFiles.sorted(by: { $0.path < $1.path }) {
+            try checkCancellation?()
+            let path = fileURL.standardizedFileURL.path
+            guard seenPaths.insert(path).inserted else { continue }
+            try remember(CostUsageScanner.parseCodexLineageDocument(
+                fileURL: fileURL,
+                checkCancellation: checkCancellation))
+        }
+
+        var nextParent = 0
+        while nextParent < pendingParentIDs.count {
+            try checkCancellation?()
+            let parentIdentity = pendingParentIDs[nextParent]
+            nextParent += 1
+            let unresolvedIdentity = CodexLineageLedger.ParentIdentity(
+                scopeID: parentIdentity.scopeID,
+                sessionID: parentIdentity.sessionID)
+            guard !knownIDs.contains(parentIdentity), !unresolvedParents.contains(unresolvedIdentity) else {
+                continue
+            }
+            guard let parentURLs = try locator.fileURLs(
+                for: parentIdentity.sessionID,
+                scopeID: parentIdentity.scopeID)
+            else {
+                unresolvedParents.insert(unresolvedIdentity)
+                continue
+            }
+            var foundParent = false
+            for parentURL in parentURLs {
+                let path = parentURL.standardizedFileURL.path
+                guard seenPaths.insert(path).inserted else { continue }
+                let parent = try CostUsageScanner.parseCodexLineageDocument(
+                    fileURL: parentURL,
+                    checkCancellation: checkCancellation)
+                let ownerID = Self.canonicalSessionID(parent.ownerID)
+                let metadataSessionID = parent.metadataSessionID.map(Self.canonicalSessionID)
+                guard ownerID == parentIdentity.sessionID || metadataSessionID == parentIdentity.sessionID else {
+                    continue
+                }
+                referencedParentDocumentCount += 1
+                foundParent = true
+                remember(parent)
+            }
+            if !foundParent {
+                unresolvedParents.insert(unresolvedIdentity)
+            }
+        }
+
+        return Report(
+            documents: documents,
+            referencedParentDocumentCount: referencedParentDocumentCount,
+            unresolvedParents: unresolvedParents)
+    }
+
+    private static func nonEmpty(_ value: String?) -> String? {
+        guard let value, !value.isEmpty else { return nil }
+        return value
+    }
+
+    private static func canonicalSessionID(_ value: String) -> String {
+        UUID(uuidString: value)?.uuidString.lowercased() ?? value
+    }
+
+    private struct ScopedIdentity: Equatable, Hashable {
+        let scopeID: String
+        let sessionID: String
+    }
+
+    private struct ParentFileLocator {
+        let roots: [URL]
+        let checkCancellation: CostUsageScanner.CancellationCheck?
+        var didIndexRoots = false
+        var filesByID: [ScopedIdentity: Set<URL>] = [:]
+
+        mutating func fileURLs(for sessionID: String, scopeID: String) throws -> [URL]? {
+            let canonicalID = CodexLineageDiscovery.canonicalSessionID(sessionID)
+            let key = ScopedIdentity(scopeID: scopeID, sessionID: canonicalID)
+            if let known = self.filesByID[key] {
+                return Self.unambiguousMatches(known)
+            }
+            if !self.didIndexRoots {
+                try self.indexRoots()
+            }
+            guard let matches = self.filesByID[key] else { return nil }
+            return Self.unambiguousMatches(matches)
+        }
+
+        private static func unambiguousMatches(_ matches: Set<URL>) -> [URL]? {
+            guard !matches.isEmpty else { return nil }
+            if matches.count == 1 {
+                return Array(matches)
+            }
+            let ownerIDs = Set(matches.compactMap(CostUsageScanner.codexRolloutOwnerID(fileURL:)))
+            guard ownerIDs.count == 1 else { return nil }
+            return matches.sorted { $0.path < $1.path }
+        }
+
+        private mutating func indexRoots() throws {
+            self.didIndexRoots = true
+            var files: [URL] = []
+            for root in self.roots {
+                try self.checkCancellation?()
+                guard let enumerator = FileManager.default.enumerator(
+                    at: root,
+                    includingPropertiesForKeys: [.isRegularFileKey],
+                    options: [.skipsHiddenFiles, .skipsPackageDescendants])
+                else { continue }
+                while let fileURL = enumerator.nextObject() as? URL {
+                    try self.checkCancellation?()
+                    guard fileURL.pathExtension.lowercased() == "jsonl" else { continue }
+                    files.append(fileURL)
+                }
+            }
+
+            for fileURL in files.sorted(by: { $0.path < $1.path }) {
+                try self.checkCancellation?()
+                if let ownerID = CostUsageScanner.codexRolloutOwnerID(fileURL: fileURL) {
+                    let canonicalID = CodexLineageDiscovery.canonicalSessionID(ownerID)
+                    let key = ScopedIdentity(
+                        scopeID: CostUsageScanner.codexLineageScopeID(fileURL: fileURL),
+                        sessionID: canonicalID)
+                    self.filesByID[key, default: []].insert(fileURL)
+                }
+                if let metadataID = try CostUsageScanner.parseCodexSessionIdentifier(
+                    fileURL: fileURL,
+                    checkCancellation: self.checkCancellation)
+                {
+                    let canonicalID = CodexLineageDiscovery.canonicalSessionID(metadataID)
+                    let key = ScopedIdentity(
+                        scopeID: CostUsageScanner.codexLineageScopeID(fileURL: fileURL),
+                        sessionID: canonicalID)
+                    self.filesByID[key, default: []].insert(fileURL)
+                }
+            }
+        }
+    }
+}