feat(spec): lift spec/EARS/todos into cecli.spec

.flake8

@@ -1,3 +1,5 @@
 [flake8]
 ignore = E203,W503
 max-line-length = 120
+per-file-ignores =
+    cecli/spec/runtime.py:E704

.pre-commit-config.yaml

@@ -8,7 +8,7 @@ repos:
     rev: 26.3.1
     hooks:
       - id: black
-        args: ["--line-length", "100", "--preview"]
+        args: ["--line-length", "100", "--preview", "--target-version", "py312"]
   - repo: https://github.com/pycqa/flake8
     rev: 7.3.0
     hooks:

cecli/spec/__init__.py

@@ -0,0 +1,36 @@
+"""Spec-driven development: EARS, workspace todos, generate/refine, implement focus."""
+
+from cecli.spec.ears import analyze_requirements, analyze_traceability, build_spec_index
+from cecli.spec.jobs import SpecGenerationJob, spec_gen_timeout_s
+from cecli.spec.progress import (
+    ImplementationStep,
+    implementation_steps,
+    mark_implementation_step_done,
+    materialize_checklist_from_tasks_md,
+    merge_agent_progress_into_tasks_md,
+    next_open_implementation_step,
+    try_mark_focus_step_complete,
+)
+from cecli.spec.pubspec_repair import (
+    PubspecRepairResult,
+    find_missing_pubspec_dependencies,
+    repair_pubspec_dependencies,
+)
+
+__all__ = [
+    "ImplementationStep",
+    "PubspecRepairResult",
+    "SpecGenerationJob",
+    "analyze_requirements",
+    "analyze_traceability",
+    "build_spec_index",
+    "find_missing_pubspec_dependencies",
+    "implementation_steps",
+    "mark_implementation_step_done",
+    "materialize_checklist_from_tasks_md",
+    "merge_agent_progress_into_tasks_md",
+    "next_open_implementation_step",
+    "repair_pubspec_dependencies",
+    "spec_gen_timeout_s",
+    "try_mark_focus_step_complete",
+]