feat(#339): add GRACE semantic code-contract anchor eval (slice 1)

docs/ARCHITECTURE.md

@@ -2571,8 +2571,8 @@ All remaining open issues are enhancements (no bugs as of 2026-07-18). Prioritiz
 ### #353 — Eval-gated prompt profile canary and rollback — CLOSED (slice 1)
 **COMPLETE (PR #374, 2026-07-18)**: `mapify prompt-profile list` command shipped. Manifest format: `.map/prompt-profiles/<id>/manifest.json` (required: `id`, `title`, `version`; optional: `description`, `owner`, `targets`, `eval_requirements`, `rollback_notes`). Active pointer: `.map/prompt-profiles/active.json` (`{"active": "<id>"|null}`). `list` command shows table with ID/title/version/status/description and active marker; `--json` for machine-readable output; stale-pointer warning when `active.json` names a non-existent profile. 20 tests in `tests/test_prompt_profile_commands.py`. Future slices: `diff`, `activate`, `rollback`, `report` commands + integration with #291 preset composition as rendering substrate.
 
-### #339 — GRACE semantic code-contract anchor eval
-Eval harness comparing inline code contracts vs prompt-injected vs no-anchor variants for bug-fix workflows. Variants: baseline, inline (LEX/MIN), prompt-injected (INJ), stale (LIE). First slice: fixture structure + report schema (JSON). No external model calls required for slice 1.
+### #339 — GRACE semantic code-contract anchor eval — CLOSED (slice 1)
+**COMPLETE (PR #375, 2026-07-18)**: `src/mapify_cli/grace_eval/` package shipped. Pure data + deterministic logic layer; no external model calls. Contracts: `GraceFixture` (fixture.json schema), `VariantRunRecord` (per-run JSONL row), `VariantAggregate` (rolled-up stats with vs-baseline deltas), `SweepFinding` (stale/contradictory contract detection result), `GraceReport` (root report object with schema_version). Six variants: `baseline`, `inline`, `lex`, `min`, `inj`, `lie`; variant sets classify each as `CODE_LOCAL`, `PROMPT_INJECTED`, or `NO_ANCHOR`. `aggregate_runs()` computes success_rate, mean_retries, mean tokens, stale_detections, and trajectory_delta_note (improvement/regression/tie/no_baseline) vs a baseline aggregate. `sweep_source()` and `sweep_variant_sources()` perform heuristic stale-anchor detection using `# CONTRACT:` / `# ANCHOR:` comment patterns and 7 contradiction signal pairs with an 8-line lookahead. 97 tests in `tests/test_grace_eval_schema.py` + `tests/test_grace_eval_sweep.py`. Future slices: CLI entry point (`mapify grace-eval run/report`), real token-log replay, model-call dispatcher, HTML report viewer.
 
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src/mapify_cli/grace_eval/__init__.py

@@ -0,0 +1,42 @@
+"""grace_eval — GRACE semantic code-contract anchor evaluation.
+
+Exports the shared data contracts and sweep utilities.  This module is a
+pure data + deterministic-logic layer for slice 1; no external model calls,
+no I/O, no subprocess, no clock access (INV-2/INV-3).
+"""
+
+from __future__ import annotations
+
+from mapify_cli.grace_eval.schema import (
+    VARIANT_NAMES,
+    CODE_LOCAL_VARIANTS,
+    PROMPT_INJECTED_VARIANTS,
+    NO_ANCHOR_VARIANTS,
+    GraceFixture,
+    GraceReport,
+    SweepFinding,
+    VariantAggregate,
+    VariantRunRecord,
+    aggregate_runs,
+    make_run_id,
+)
+from mapify_cli.grace_eval.sweep import (
+    sweep_source,
+    sweep_variant_sources,
+)
+
+__all__ = [
+    "VARIANT_NAMES",
+    "CODE_LOCAL_VARIANTS",
+    "PROMPT_INJECTED_VARIANTS",
+    "NO_ANCHOR_VARIANTS",
+    "GraceFixture",
+    "GraceReport",
+    "SweepFinding",
+    "VariantAggregate",
+    "VariantRunRecord",
+    "aggregate_runs",
+    "make_run_id",
+    "sweep_source",
+    "sweep_variant_sources",
+]