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feat(FN-5633): standalone AI merge path (clean-room merge + AI reviewer)

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New default merge path (merger.mode="ai"), self-contained in merger-ai.ts and
dispatched from ProjectEngine.onMerge instead of the legacy aiMergeTask pipeline
(kept for merger.mode="deterministic").

Flow: clean-room detached worktree at the target branch tip → AI agent merges
the task branch + squashes (resolving conflicts) → fresh read-only AI reviewer
audits with corrective retries (blocking vs advisory; advisory lands, unfixable
correctness hard-fails via AiMergeBlockedError; fail-safe verdict parsing) →
land via `git merge --ff-only` when the checkout is on the target (else
update-ref CAS) → sync the local checkout (stash → ff → restore; AI reconciles
a conflicting restore and keeps the original edits in a backup stash;
un-stashable dirt advances the ref + warns) → finalize (delete task branch —
never the integration branch — task→done, remove temp worktree).

- Per-task target branch honored (falls back to the default integration
  branch); local checkout synced only when on that target.
- Structurally immune to the dirty-clobber and stale-base/non-FF bug classes of
  the legacy path (clean room + FF-by-construction).
- Progress surfaced on the task status pill + task log stream.
- Clear error when the target branch has no local ref.

Settings: merger.mode / merger.reviewerModel / merger.maxReviewPasses, surfaced
in Settings → Merge; legacy merge-mechanics settings hidden when AI mode is on.

Tests: merger-ai.test.ts (verdict parser, clean merge, blocking hard-fail,
advisory land, empty no-op, target-branch isolation, missing-target error,
landSquash clean/other-branch/dirty-restore/AI-resolved). Legacy
merge-orchestration tests pinned to deterministic mode.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
gsxdsm
2026-05-28 18:50:23 -07:00
parent e75c4dae28
commit 29ac58f8d0
13 changed files with 1242 additions and 8 deletions
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4
packages/core/src/index.ts
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@@ -1,5 +1,5 @@
export { COLUMNS, DEFAULT_COLUMN, isColumn, normalizeColumn, COLUMN_LABELS, COLUMN_DESCRIPTIONS, VALID_TRANSITIONS, DEFAULT_SETTINGS, DEFAULT_GLOBAL_SETTINGS, DEFAULT_PROJECT_SETTINGS, GLOBAL_SETTINGS_KEYS, PROJECT_SETTINGS_KEYS, isGlobalSettingsKey, isProjectSettingsKey, resolvePersistAgentThinkingLog, THINKING_LEVELS, THEME_MODES, COLOR_THEMES, WORKFLOW_STEP_TEMPLATES, AGENT_PERMISSIONS, PERMANENT_AGENT_ACTION_CATEGORIES, AGENT_PERMISSION_POLICY_ACTION_CATEGORIES, AGENT_PROVISIONING_APPROVAL_MODES, SANDBOX_PROVISIONING_APPROVAL_MODES, AGENT_PERMISSION_POLICY_PRESET_IDS, LEGACY_AGENT_PERMISSION_POLICY_ACTION_CATEGORY_ALIASES, APPROVAL_REQUEST_STATUSES, APPROVAL_REQUEST_AUDIT_EVENT_TYPES, normalizeApprovalRequestActionCategory, isValidApprovalRequestTransition, agentToConfigSnapshot, diffConfigSnapshots, isEphemeralAgent, hasAgentIdentity, CheckoutConflictError, DEFAULT_HEARTBEAT_PROCEDURE_PATH, getDefaultHeartbeatProcedurePath, EXECUTION_MODES, DEFAULT_EXECUTION_MODE, TASK_PRIORITIES, DEFAULT_TASK_PRIORITY, HIGH_FANOUT_BLOCKER_TODO_THRESHOLD, STALE_HIGH_FANOUT_BLOCKER_AGE_THRESHOLD_MS, DASHBOARD_USER_ID, normalizeMessageParticipant, validateMessageMetadata, validateDockerNodeConfig, sanitizeDockerNodeConfigForResponse, normalizeMergeIntegrationWorktreeMode, normalizeMergeAdvanceAutoSyncMode, MERGE_ADVANCE_AUTO_SYNC_MODES, normalizeMergeConflictStrategy, normalizeMergeStrategyOverlapBehavior, normalizePostMergeAuditMode, POST_MERGE_AUDIT_MODES, normalizeMergeAuditAutoRecovery, MERGE_AUDIT_AUTO_RECOVERY_MODES, normalizeAutoRecovery, AUTO_RECOVERY_MODES, buildResearchDocumentKey, REPO_OVERRIDE_RE, SHARED_STATE_SNAPSHOT_VERSION } from "./types.js";
export type { Column, IssueInfo, IssueState, TaskSourceIssue, PrInfo, PrConflictState, PrConflictDiagnostics, PrCheckState, PrCheckStatus, PrStatus, Task, TaskTokenUsage, TaskAttachment, TaskComment, TaskCommentInput, TaskDocument, TaskDocumentRevision, TaskDocumentCreateInput, TaskDocumentWithTask, TaskCreateInput, MeshReplicatedTaskCreatePayload, MeshReplicatedTaskApplyResult, TaskSource, SourceType, TaskDetail, RetrySummary, InboxTask, TodoList, TodoItem, TodoListCreateInput, TodoListUpdateInput, TodoItemCreateInput, TodoItemUpdateInput, TodoListWithItems, AgentLogEntry, AgentLogType, AgentRole, BoardConfig, DistributedTaskIdReserveInput, DistributedTaskIdReserveResult, DistributedTaskIdCommitInput, DistributedTaskIdCommitResult, DistributedTaskIdAbortInput, DistributedTaskIdAbortResult, DistributedTaskIdStateInput, DistributedTaskIdStateResult, AutostashOrphanRecord, AutostashOutcome, MergeDetails, MergeResult, MergeIntegrationWorktreeMode, MergeAdvanceAutoSyncMode, MergeConflictStrategy, CanonicalMergeConflictStrategy, MergeStrategyOverlapBehavior, PostMergeAuditMode, MergeAuditAutoRecoveryMode, AutoRecoveryMode, AutoRecoveryFailureClass, AutoRecoverySettings, DirectMergeCommitStrategy, Settings, GlobalSettings, ProjectSettings, SecretsEnvConfig, WebSearchBackend, ResearchEnabledSources, ResearchGlobalDefaults, ResearchProjectLimits, ResearchProjectSettings, SandboxBackendName, SandboxFailureMode, SandboxPolicy, SandboxProjectSettings, EvalFollowUpPolicy, EvalProjectSettings, ResolvedEvalSettings, SettingsScope, DaemonTokenSettings, TaskStep, StepStatus, TaskLogEntry, RunMutationContext, ActivityLogEntry, ActivityEventType, ThinkingLevel, ThemeMode, ColorTheme, ExecutionMode, TaskPriority, MergeQueueEntry, MergeQueueEnqueueOptions, MergeQueueAcquireOptions, MergeQueueReleaseOutcome, HandoffEvidence, HandoffToReviewOptions, UnavailableNodePolicy, OwningNodeHandoffPolicy, PlanningQuestion, PlanningSummary, PlanningResponse, PlanningQuestionType, ArchivedTaskEntry, BatchStatusRequest, BatchStatusResponse, BatchStatusEntry, BatchStatusResult, GithubIssueAction, ModelPreset, WorkflowStep, WorkflowStepMode, WorkflowStepGateMode, WorkflowStepPhase, WorkflowStepInput, WorkflowStepResult, WorkflowStepTemplate, Agent, OrgTreeNode, AgentState, AgentDetail, AgentCreateInput, AgentUpdateInput, AgentApiKey, AgentApiKeyCreateResult, AgentCapability, AgentPromptTemplate, AgentPromptsConfig, AgentPermission, PermanentAgentActionCategory, PermanentAgentSensitiveActionCategory, PermanentAgentGatingContext, AgentPermissionPolicy, AgentPermissionPolicyRules, AgentPermissionPolicyActionCategory, AgentProvisioningApprovalMode, SandboxProvisioningApprovalMode, LegacyAgentPermissionPolicyActionCategory, ApprovalRequestActionCategoryInput, ApprovalRequestActionCategory, AgentPermissionPolicyDisposition, AgentPermissionPolicyPresetId, ApprovalRequestStatus, ApprovalRequestAuditEventType, ApprovalRequestActorSnapshot, ApprovalRequestTargetAction, ApprovalRequestAuditEvent, ApprovalRequest, ApprovalRequestCreateInput, ApprovalRequestDecisionInput, ApprovalRequestCompletionInput, ApprovalRequestListInput, TaskAssignSource, AgentAccessState, AgentHeartbeatConfig, AgentBudgetConfig, AgentBudgetStatus, InstructionsBundleConfig, MessageResponseMode, AgentHeartbeatEvent, AgentHeartbeatRun, BlockedStateSnapshot, HeartbeatInvocationSource, AgentTaskSession, AgentRating, AgentRatingSummary, AgentRatingInput, AgentConfigSnapshot, RevisionFieldDiff, AgentConfigRevision, AgentStats, ReflectionTrigger, ReflectionMetrics, AgentReflection, AgentPerformanceSummary, NtfyNotificationEvent, NotificationEvent, NotificationPayload, NotificationProviderConfig, CustomProvider, SteeringComment, ParticipantType, MessageType, Message, MessageCreateInput, MessageFilter, MessageMetadata, MessageReplyReference, Mailbox, CheckoutLease, CheckoutClaimPrecondition, TaskClaimRow, CentralClaimStore, RunAuditDomain, RunAuditEvent, RunAuditEventInput, RunAuditEventFilter, AgentMemoryInclusionMode, HeartbeatPromptTemplate, HeartbeatScopeDisciplineMode, WorktrunkSettings, WorktrunkOnFailure } from "./types.js";
export { COLUMNS, DEFAULT_COLUMN, isColumn, normalizeColumn, COLUMN_LABELS, COLUMN_DESCRIPTIONS, VALID_TRANSITIONS, DEFAULT_SETTINGS, DEFAULT_GLOBAL_SETTINGS, DEFAULT_PROJECT_SETTINGS, GLOBAL_SETTINGS_KEYS, PROJECT_SETTINGS_KEYS, isGlobalSettingsKey, isProjectSettingsKey, resolvePersistAgentThinkingLog, THINKING_LEVELS, THEME_MODES, COLOR_THEMES, WORKFLOW_STEP_TEMPLATES, AGENT_PERMISSIONS, PERMANENT_AGENT_ACTION_CATEGORIES, AGENT_PERMISSION_POLICY_ACTION_CATEGORIES, AGENT_PROVISIONING_APPROVAL_MODES, SANDBOX_PROVISIONING_APPROVAL_MODES, AGENT_PERMISSION_POLICY_PRESET_IDS, LEGACY_AGENT_PERMISSION_POLICY_ACTION_CATEGORY_ALIASES, APPROVAL_REQUEST_STATUSES, APPROVAL_REQUEST_AUDIT_EVENT_TYPES, normalizeApprovalRequestActionCategory, isValidApprovalRequestTransition, agentToConfigSnapshot, diffConfigSnapshots, isEphemeralAgent, hasAgentIdentity, CheckoutConflictError, DEFAULT_HEARTBEAT_PROCEDURE_PATH, getDefaultHeartbeatProcedurePath, EXECUTION_MODES, DEFAULT_EXECUTION_MODE, TASK_PRIORITIES, DEFAULT_TASK_PRIORITY, HIGH_FANOUT_BLOCKER_TODO_THRESHOLD, STALE_HIGH_FANOUT_BLOCKER_AGE_THRESHOLD_MS, DASHBOARD_USER_ID, normalizeMessageParticipant, validateMessageMetadata, validateDockerNodeConfig, sanitizeDockerNodeConfigForResponse, normalizeMergeIntegrationWorktreeMode, normalizeMergeAdvanceAutoSyncMode, MERGE_ADVANCE_AUTO_SYNC_MODES, normalizeMergeConflictStrategy, normalizeMergeStrategyOverlapBehavior, normalizePostMergeAuditMode, POST_MERGE_AUDIT_MODES, normalizeMergeAuditAutoRecovery, MERGE_AUDIT_AUTO_RECOVERY_MODES, normalizeMergerMode, MERGER_MODES, normalizeAutoRecovery, AUTO_RECOVERY_MODES, buildResearchDocumentKey, REPO_OVERRIDE_RE, SHARED_STATE_SNAPSHOT_VERSION } from "./types.js";
export type { Column, IssueInfo, IssueState, TaskSourceIssue, PrInfo, PrConflictState, PrConflictDiagnostics, PrCheckState, PrCheckStatus, PrStatus, Task, TaskTokenUsage, TaskAttachment, TaskComment, TaskCommentInput, TaskDocument, TaskDocumentRevision, TaskDocumentCreateInput, TaskDocumentWithTask, TaskCreateInput, MeshReplicatedTaskCreatePayload, MeshReplicatedTaskApplyResult, TaskSource, SourceType, TaskDetail, RetrySummary, InboxTask, TodoList, TodoItem, TodoListCreateInput, TodoListUpdateInput, TodoItemCreateInput, TodoItemUpdateInput, TodoListWithItems, AgentLogEntry, AgentLogType, AgentRole, BoardConfig, DistributedTaskIdReserveInput, DistributedTaskIdReserveResult, DistributedTaskIdCommitInput, DistributedTaskIdCommitResult, DistributedTaskIdAbortInput, DistributedTaskIdAbortResult, DistributedTaskIdStateInput, DistributedTaskIdStateResult, AutostashOrphanRecord, AutostashOutcome, MergeDetails, MergeResult, MergeIntegrationWorktreeMode, MergeAdvanceAutoSyncMode, MergeConflictStrategy, CanonicalMergeConflictStrategy, MergeStrategyOverlapBehavior, PostMergeAuditMode, MergeAuditAutoRecoveryMode, MergerMode, MergerSettings, AutoRecoveryMode, AutoRecoveryFailureClass, AutoRecoverySettings, DirectMergeCommitStrategy, Settings, GlobalSettings, ProjectSettings, SecretsEnvConfig, WebSearchBackend, ResearchEnabledSources, ResearchGlobalDefaults, ResearchProjectLimits, ResearchProjectSettings, SandboxBackendName, SandboxFailureMode, SandboxPolicy, SandboxProjectSettings, EvalFollowUpPolicy, EvalProjectSettings, ResolvedEvalSettings, SettingsScope, DaemonTokenSettings, TaskStep, StepStatus, TaskLogEntry, RunMutationContext, ActivityLogEntry, ActivityEventType, ThinkingLevel, ThemeMode, ColorTheme, ExecutionMode, TaskPriority, MergeQueueEntry, MergeQueueEnqueueOptions, MergeQueueAcquireOptions, MergeQueueReleaseOutcome, HandoffEvidence, HandoffToReviewOptions, UnavailableNodePolicy, OwningNodeHandoffPolicy, PlanningQuestion, PlanningSummary, PlanningResponse, PlanningQuestionType, ArchivedTaskEntry, BatchStatusRequest, BatchStatusResponse, BatchStatusEntry, BatchStatusResult, GithubIssueAction, ModelPreset, WorkflowStep, WorkflowStepMode, WorkflowStepGateMode, WorkflowStepPhase, WorkflowStepInput, WorkflowStepResult, WorkflowStepTemplate, Agent, OrgTreeNode, AgentState, AgentDetail, AgentCreateInput, AgentUpdateInput, AgentApiKey, AgentApiKeyCreateResult, AgentCapability, AgentPromptTemplate, AgentPromptsConfig, AgentPermission, PermanentAgentActionCategory, PermanentAgentSensitiveActionCategory, PermanentAgentGatingContext, AgentPermissionPolicy, AgentPermissionPolicyRules, AgentPermissionPolicyActionCategory, AgentProvisioningApprovalMode, SandboxProvisioningApprovalMode, LegacyAgentPermissionPolicyActionCategory, ApprovalRequestActionCategoryInput, ApprovalRequestActionCategory, AgentPermissionPolicyDisposition, AgentPermissionPolicyPresetId, ApprovalRequestStatus, ApprovalRequestAuditEventType, ApprovalRequestActorSnapshot, ApprovalRequestTargetAction, ApprovalRequestAuditEvent, ApprovalRequest, ApprovalRequestCreateInput, ApprovalRequestDecisionInput, ApprovalRequestCompletionInput, ApprovalRequestListInput, TaskAssignSource, AgentAccessState, AgentHeartbeatConfig, AgentBudgetConfig, AgentBudgetStatus, InstructionsBundleConfig, MessageResponseMode, AgentHeartbeatEvent, AgentHeartbeatRun, BlockedStateSnapshot, HeartbeatInvocationSource, AgentTaskSession, AgentRating, AgentRatingSummary, AgentRatingInput, AgentConfigSnapshot, RevisionFieldDiff, AgentConfigRevision, AgentStats, ReflectionTrigger, ReflectionMetrics, AgentReflection, AgentPerformanceSummary, NtfyNotificationEvent, NotificationEvent, NotificationPayload, NotificationProviderConfig, CustomProvider, SteeringComment, ParticipantType, MessageType, Message, MessageCreateInput, MessageFilter, MessageMetadata, MessageReplyReference, Mailbox, CheckoutLease, CheckoutClaimPrecondition, TaskClaimRow, CentralClaimStore, RunAuditDomain, RunAuditEvent, RunAuditEventInput, RunAuditEventFilter, AgentMemoryInclusionMode, HeartbeatPromptTemplate, HeartbeatScopeDisciplineMode, WorktrunkSettings, WorktrunkOnFailure } from "./types.js";
export { AGENT_VALID_TRANSITIONS, DUPLICATE_OF_METADATA_KEY } from "./types.js";
export { customProviderRegistryKey } from "./custom-provider-key.js";
export { MOCK_PROVIDER_ID } from "./mock-provider-constants.js";

1
packages/core/src/settings-schema.ts
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@@ -262,6 +262,7 @@ export const DEFAULT_PROJECT_SETTINGS = {
],
prerebaseDivergenceThreshold: 50,
mergeConflictStrategy: "smart-prefer-main",
merger: { mode: "ai", reviewerModel: undefined, maxReviewPasses: 3 },
mergeDiffVolumeMinLines: undefined,
mergeDiffVolumeThreshold: undefined,
mergeDiffVolumeAllowlist: undefined,

34
packages/core/src/types.ts
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@@ -313,6 +313,36 @@ export function normalizeMergeAuditAutoRecovery(value: unknown): MergeAuditAutoR
: "ai-assisted";
}
export const MERGER_MODES = ["ai", "deterministic"] as const;
/**
* Merge execution path (FN-5633).
* - "ai" (default): the standalone AI merge path — a clean-room worktree where
* an AI agent merges the task branch and an AI reviewer audits it (with
* corrective retries) before a fast-forward landing. Bypasses the legacy
* scaffolding entirely.
* - "deterministic": the legacy `aiMergeTask` pipeline (prerebase /
* conflict-strategy ladder / post-merge audit / transient self-heal).
*/
export type MergerMode = (typeof MERGER_MODES)[number];
export function normalizeMergerMode(value: unknown): MergerMode {
return typeof value === "string" && (MERGER_MODES as readonly string[]).includes(value)
? (value as MergerMode)
: "ai";
}
/** Settings for the AI merge path (FN-5633). */
export interface MergerSettings {
/** Which merge path to use. Default: "ai". */
mode?: MergerMode;
/** Optional `provider/modelId` override for the read-only reviewer agent. */
reviewerModel?: string;
/** How many AI corrective rounds before landing the best result (advisory) or
* hard-failing (blocking). Default: 3. */
maxReviewPasses?: number;
}
export const AUTO_RECOVERY_MODES = ["off", "deterministic-only", "programmatic", "ai-assisted"] as const;
export type AutoRecoveryMode = (typeof AUTO_RECOVERY_MODES)[number];
@@ -3015,6 +3045,10 @@ export interface ProjectSettings {
/** Strategy used when a merge conflict can't be resolved by AI. See
* {@link MergeConflictStrategy}. Default: "smart". */
mergeConflictStrategy?: MergeConflictStrategy;
/** AI merge path configuration (FN-5633). See {@link MergerSettings}.
* When mode is "ai" (default), the standalone AI merge path is used and the
* legacy merge settings above/below it do not apply. */
merger?: MergerSettings;
/** Minimum branch net line volume before the pre-commit diff-volume gate evaluates a file. Default applied at read site: 20. */
mergeDiffVolumeMinLines?: number;
/** Minimum staged/branch-net ratio required by the pre-commit diff-volume gate. Default applied at read site: 0.2. */