[codex] Consolidate specs under spec directory

AGENTS.md

@@ -7,9 +7,12 @@ GitHub Issues + local sprint execution files for Claude Code / Codex.
 ```
 skills/
   spec-charter/
-    SKILL.md               ← CHARTER.md create/amend + reassess contract
+    SKILL.md               ← spec/charter.md create/amend + reassess contract
     references/            ← Detailed specs (on-demand)
     scripts/               ← Deterministic helpers (node)
+  spec-system-map/
+    SKILL.md               ← spec/system-map.md high-level system map contract
+    templates/             ← Runtime system-map template
   spec-grill/
     SKILL.md               ← spec/capabilities.md grill contract
     references/            ← Detailed specs (on-demand)
@@ -36,6 +39,10 @@ GitHub (what)  ↔  gh CLI  ↔  backlog/sprints/ (how + context)
                               backlog/tasks/   (thin mirror)
 ```
 
+## Project Spec Home
+
+Durable project specs live under `spec/`: `charter.md`, `system-map.md`, and `capabilities.md`. Root `CHARTER.md` is legacy fallback only.
+
 ## Working on This Project
 
 - All content in English (Korean in trigger keywords only)

CHANGELOG.md

@@ -8,7 +8,8 @@ Each entry links the GitHub issue (the canonical spec) and the merge PR (the shi
 
 ### Changed
 
-- Split the old `backlog-charter` surface into the spec-series skills `spec-charter` and `spec-grill`. `spec-charter` owns `CHARTER.md` create/amend/reassess; `spec-grill` owns `spec/capabilities.md` capability-contract authoring. Closes [#157](https://github.com/sungjunlee/dev-backlog/issues/157), [#158](https://github.com/sungjunlee/dev-backlog/issues/158), and [#159](https://github.com/sungjunlee/dev-backlog/issues/159).
+- Consolidated active spec-series artifacts under `spec/`: `spec/charter.md`, `spec/system-map.md`, and `spec/capabilities.md`, with root `CHARTER.md` retained only as a legacy fallback. Added `spec-system-map`, `spec/README.md`, dogfood `spec/system-map.md`, and script/docs compatibility updates. Closes [#161](https://github.com/sungjunlee/dev-backlog/issues/161), [#162](https://github.com/sungjunlee/dev-backlog/issues/162), [#163](https://github.com/sungjunlee/dev-backlog/issues/163), [#164](https://github.com/sungjunlee/dev-backlog/issues/164), and [#165](https://github.com/sungjunlee/dev-backlog/issues/165).
+- Split the old `backlog-charter` surface into the spec-series skills `spec-charter` and `spec-grill`. `spec-charter` owns charter create/amend/reassess; `spec-grill` owns `spec/capabilities.md` capability-contract authoring. Closes [#157](https://github.com/sungjunlee/dev-backlog/issues/157), [#158](https://github.com/sungjunlee/dev-backlog/issues/158), and [#159](https://github.com/sungjunlee/dev-backlog/issues/159).
 
 ## [0.5.0] — 2026-05-22
 

CLAUDE.md

@@ -9,9 +9,12 @@ GitHub Issues + local sprint execution files for Claude Code / Codex.
 ```text
 skills/
   spec-charter/
-    SKILL.md               ← CHARTER.md create/amend + reassess contract
+    SKILL.md               ← spec/charter.md create/amend + reassess contract
     references/            ← Amendment, alignment, objective, reassess specs
-    templates/             ← Runtime CHARTER.md template
+    templates/             ← Runtime charter template
+  spec-system-map/
+    SKILL.md               ← spec/system-map.md high-level system map contract
+    templates/             ← Runtime system-map template
   spec-grill/
     SKILL.md               ← spec/capabilities.md grill contract
     references/            ← Capability heuristics + spec-system research
@@ -43,6 +46,10 @@ GitHub (what)  ↔  gh CLI  ↔  backlog/sprints/ (how + context)
                               backlog/tasks/   (thin mirror)
 ```
 
+## Project Spec Home
+
+Durable project specs live under `spec/`: `charter.md`, `system-map.md`, and `capabilities.md`. Root `CHARTER.md` is legacy fallback only.
+
 ## Working on This Project
 
 - All content in English (Korean in trigger keywords only)

README.md

@@ -98,10 +98,11 @@ Optional spec-series setup:
 
 ```text
 /spec-charter create
+/spec-system-map
 /spec-grill
 ```
 
-`spec-charter` creates the project-wide `CHARTER.md` axis. On existing repos, follow it with `spec-grill` to author `spec/capabilities.md`, the middle layer of capability contracts and Hard Constraints.
+`spec-charter` creates the project-wide `spec/charter.md` axis. On existing repos, follow it with `spec-system-map` for `spec/system-map.md` and `spec-grill` for `spec/capabilities.md`. The spec index lives at [spec/README.md](spec/README.md).
 
 For the detailed sprint contract, section semantics, and full script inventory, see [skills/dev-backlog/SKILL.md](skills/dev-backlog/SKILL.md).