diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d78c30..ad71f0e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## Unreleased
+
+Release candidate for **v2.3.0**.
+
+- Adds `project/1.1`, an additive optional `profile` field with `general`,
+  `engineering`, `software`, and `research` values. The field selects a
+  presentation template; it does not change project identity or core state.
+- Keeps `project/1.0` valid for existing projects. Producers that emit `profile`
+  must identify the record as `project/1.1` or a later compatible minor.
+- Broadens the product wording from research-only to long-running projects while
+  retaining research as the flagship reference profile. Experimental run and
+  claim-evidence contracts are not part of this stable-core candidate.
+
 ## v2.2.0 — 2026-07-20
 
 - Replaces all public worked examples and domain-bearing invalid fixtures with a
diff --git a/README.md b/README.md
index acd6c70..e6ae1a0 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,9 @@ English | [中文](README.zh.md)
 > The shared data contracts that let the Scriptorium suite's tools exchange files.
 
 > **Product status: Public Alpha contract baseline.** The Public Alpha
-> target is Windows-first and requires at least one agent host. Codex and Claude
+> target is Windows-first and requires at least one agent host. The core contracts
+> support general, engineering, software, and research projects. Experimental run
+> and claim-evidence contracts are outside this stable baseline. Codex and Claude
 > Code are the two first-class target choices; canonical installers now exist, while
 > Claude Code live `SessionEnd` golden-path parity remains a release gap. The user's Markdown workspace,
 > PDFs, and code remain authoritative; Provenance supplies local capture, search,
@@ -28,9 +30,11 @@ See the contracts run through a real-interface, synthetic-data workflow in the
 ## Overview
 
 Scriptorium Spec defines the file formats used by the **Scriptorium** suite — a
-local-first research workflow designed for GitHub-comfortable researchers using
-at least one of its two target hosts, Codex or Claude Code, on Windows. Its core works
-over an ordinary project directory:
+local-first project context and continuity product for GitHub-comfortable users of
+long-running work. Research is the flagship reference profile, while the same core
+project, note, and session contracts support engineering maintenance and personal
+software development. The Windows-first core uses at least one of its two target
+hosts, Codex or Claude Code, and works over an ordinary project directory:
 Markdown, PDFs, and code remain user-owned sources of truth. Provenance records
 derived project context and high-value claims through an approval-backed memory
 workflow; optional tools add reference-library governance and slide output. It
@@ -156,12 +160,13 @@ the entrypoint ownership ADR defines that Public Alpha release boundary.
 
 ## Status
 
-**Public Alpha contract baseline: v2.2.0.** This baseline targets compatibility with
-Scriptorium v0.1.0; it does not claim that every component tag is already published.
-Cross-repository and Windows CI golden paths cover
+**Stable-core contract candidate: v2.3.0.** The latest published baseline remains
+v2.2.0 until the candidate is committed, reviewed, tagged, and released.
+Cross-repository and Windows acceptance paths cover
 the `init`/`doctor`/`status`/`inventory`/`demo`/`pull` entry and canonical host
-installers, but adapter-specific reviewed migration execution, a packaged suite
-installer, and external beta evidence remain product gaps.
+installers. The umbrella candidate now also exposes pinned component profiles and a
+preview-first source installer; fresh remote CI and external beta evidence remain
+release gaps.
 The event/sync-layer contracts (`note/1.0`, `session-summary/1.0`) are
 implemented in Provenance; Provenance ingestion of parsed-paper/reading-note/review/
 lineage is not yet implemented.
diff --git a/README.zh.md b/README.zh.md
index ebd77ce..3aae38a 100644
--- a/README.zh.md
+++ b/README.zh.md
@@ -5,7 +5,8 @@
 > 让 Scriptorium 套件各工具彼此交换文件的共享数据契约。
 
 > **产品状态：Public Alpha 契约基线。** Public Alpha 目标以 Windows
-> 为首发平台，并要求至少选择一个 agent 宿主；Codex 与 Claude Code 是地位相同的一等
+> 为首发平台，并要求至少选择一个 agent 宿主。核心契约支持通用、工程、软件和科研
+> 项目；实验运行与论断证据契约不进入本轮稳定基线。Codex 与 Claude Code 是地位相同的一等
 > 目标宿主；canonical installer 已实现，但 Claude Code 的 live `SessionEnd` golden
 > path 对等验证仍是 release gap。用户的
 > Markdown 工作区、PDF 与代码保持权威；Provenance 提供
@@ -148,11 +149,11 @@ Steward 的源码包名为 `scriptorium-steward`，CLI 为 `steward`。Provenanc
 
 ## 状态
 
-**Public Alpha 契约基线：v2.2.0。** 该基线以 Scriptorium v0.1.0 为兼容目标，
-不表示所有组件 tag 已经发布。跨仓与 Windows CI golden path 已覆盖
+**稳定核心契约候选：v2.3.0。** 在候选内容提交、复审、打标签并发布前，最近的已发布
+基线仍是 v2.2.0。跨仓与 Windows 验收路径已覆盖
 `init`/`doctor`/`status`/`inventory`/`demo`/
-`pull` 入口及 canonical host installer，但适配器级的人审迁移执行、套件安装包与
-外部 beta 证据仍是产品缺口。事件/同步层契约
+`pull` 入口及 canonical host installer；umbrella 候选也已提供固定组件组合与默认预览
+的源码安装器。重新运行远端 CI 与外部 beta 证据仍是发布缺口。事件/同步层契约
 （`note/1.0`、`session-summary/1.0`）已在 Provenance 实现；parsed-paper/reading-note/
 review/lineage 摄取尚未实现。
 
diff --git a/examples/project.v1.example.json b/examples/project.v1.example.json
index 5f5db39..8231bb2 100644
--- a/examples/project.v1.example.json
+++ b/examples/project.v1.example.json
@@ -1,7 +1,8 @@
 {
- "schema_version": "project/1.0",
+ "schema_version": "project/1.1",
  "project_id": "synthetic-xq17-calibration",
  "title": "[SYNTHETIC] XQ-17 calibration demo",
+ "profile": "research",
  "status": "active",
  "stage": "synthetic validation",
  "priority": "medium",
diff --git a/pyproject.toml b/pyproject.toml
index 99232dc..ac2d726 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "scriptorium-spec"
-version = "2.2.0"
+version = "2.3.0"
 description = "Shared data contracts for the Scriptorium suite"
 requires-python = "==3.12.*"
 dependencies = []
diff --git a/schemas/project/v1.json b/schemas/project/v1.json
index efc393e..e1963af 100644
--- a/schemas/project/v1.json
+++ b/schemas/project/v1.json
@@ -2,7 +2,7 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "https://github.com/scriptorium-suite/scriptorium-spec/blob/main/schemas/project/v1.json",
   "title": "Scriptorium Project Record v1",
-  "description": "One research project in the user-owned Markdown workspace. The reference adapter materializes it as Projects/<project_id>.md whose YAML frontmatter conforms to this schema; the body remains human-authored Markdown plus the separately owned append-only progress-log region. Obsidian is an optional editor. Provenance ingests supported frontmatter for portfolio and context retrieval without becoming the owner of the source file.",
+  "description": "One long-running project in the user-owned Markdown workspace. Research, engineering, and personal software work are supported profiles over the same project contract. The reference adapter materializes it as Projects/<project_id>.md whose YAML frontmatter conforms to this schema; the body remains human-authored Markdown plus the separately owned append-only progress-log region. Obsidian is an optional editor. Provenance ingests supported frontmatter for portfolio and context retrieval without becoming the owner of the source file.",
   "type": "object",
   "required": ["schema_version", "project_id", "title", "status"],
   "properties": {
@@ -13,6 +13,11 @@
       "description": "Stable kebab-case id; should match the repo dir name when there is one."
     },
     "title": { "type": "string" },
+    "profile": {
+      "type": "string",
+      "enum": ["general", "research", "engineering", "software"],
+      "description": "Optional presentation template introduced in project/1.1. It does not change project identity or the core state contract."
+    },
     "status": {
       "type": "string",
       "enum": ["planned", "active", "paused", "done", "archived"]
@@ -42,5 +47,15 @@
       "description": "Provenance attribution key (usually the repo dir name) so the hub can tie this project's AI sessions to it."
     },
     "updated": { "type": "string", "description": "ISO date of last update." }
-  }
+  },
+  "allOf": [
+    {
+      "if": { "required": ["profile"] },
+      "then": {
+        "properties": {
+          "schema_version": { "type": "string", "pattern": "^project/1\\.(?:[1-9][0-9]*)$" }
+        }
+      }
+    }
+  ]
 }
diff --git a/tests/fixtures/invalid/project.invalid-profile.json b/tests/fixtures/invalid/project.invalid-profile.json
new file mode 100644
index 0000000..b131431
--- /dev/null
+++ b/tests/fixtures/invalid/project.invalid-profile.json
@@ -0,0 +1,7 @@
+{
+  "schema_version": "project/1.1",
+  "project_id": "demo-project",
+  "title": "Synthetic project",
+  "profile": "unsupported",
+  "status": "planned"
+}
diff --git a/tests/fixtures/invalid/project.profile-with-v1.0.json b/tests/fixtures/invalid/project.profile-with-v1.0.json
new file mode 100644
index 0000000..97f82c3
--- /dev/null
+++ b/tests/fixtures/invalid/project.profile-with-v1.0.json
@@ -0,0 +1,7 @@
+{
+  "schema_version": "project/1.0",
+  "project_id": "demo-project",
+  "title": "Synthetic project",
+  "profile": "software",
+  "status": "planned"
+}
diff --git a/tools/validate.py b/tools/validate.py
index fa1f6de..7d1b1af 100644
--- a/tools/validate.py
+++ b/tools/validate.py
@@ -70,6 +70,7 @@ def validate_handoff(doc, errors):
 
 
 PROJECT_STATUS = {"planned", "active", "paused", "done", "archived"}
+PROJECT_PROFILES = {"general", "research", "engineering", "software"}
 NOTE_SOURCES = {"obsidian", "openclaw", "agent"}
 APPROVAL_STATES = {"draft", "approved", "applied"}
 READING_STATUSES = {"New", "To Read", "In Progress", "Read", "Not Reading"}
@@ -90,6 +91,10 @@ def validate_project(doc, errors):
         err(errors, "title", "missing title")
     if doc.get("status") not in PROJECT_STATUS:
         err(errors, "status", f"invalid status: {doc.get('status')!r}")
+    if "profile" in doc and doc["profile"] not in PROJECT_PROFILES:
+        err(errors, "profile", f"invalid profile: {doc.get('profile')!r}")
+    if "profile" in doc and doc.get("schema_version") == "project/1.0":
+        err(errors, "schema_version", "profile requires project/1.1 or later")
 
 
 def validate_note(doc, errors):
diff --git a/uv.lock b/uv.lock
index 8600d09..4bfd46c 100644
--- a/uv.lock
+++ b/uv.lock
@@ -128,7 +128,7 @@ wheels = [
 
 [[package]]
 name = "scriptorium-spec"
-version = "2.2.0"
+version = "2.3.0"
 source = { virtual = "." }
 
 [package.dev-dependencies]