docs: update architecture for package-by-feature (#234)

AGENTS.md Architecture section + docs/PLAN.md now describe the
src/{app,shared,features} layout, the Container DI composition root,
named imports (J barrel gone), the split Configuration facade, and the
shared/events bus. PLAN.md 2.1/2.3 marked complete, 2.6 partial, new 2.7
tracks restructure phases (1-4 done via #235-#238, Phase 5 = #239).

Refs #234.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: pajoma

AGENTS.md

@@ -40,35 +40,42 @@ CI (`.github/workflows/ci.yml`) runs lint → compile → compile-tests → `xvf
 
 ## Architecture
 
-Entry: `src/extension.ts` → `Startup(config).run(context)` (in `src/vscode/startup.ts`) which initializes the `Ctrl` service locator and registers commands, code actions, and optional syntax highlighting.
+The source is organized **package-by-feature** (restructured in #234). Three top-level zones:
 
-**Service locator pattern.** `Ctrl` (`src/util/controller.ts`) is two-phase: (1) constructor creates `Configuration` only; (2) `initServices(logger: ILogger)` creates all services (`Inject`, `Writer`, `Parser`, `Dialogues`, `Reader`) in dependency order. `Startup.registerLoggingChannel` triggers phase 2 by constructing `ConsoleLogger` then calling `initServices`. Every command/provider still receives `Ctrl` and accesses services via getters — narrowing that layer is Phase 2.3. Action/UI classes now accept narrow sub-interface params; see `src/model/interfaces.ts` for `IConfiguration`, `ILogger`, `IParser`, `IWriter`, `IInject`, `IDialogues`.
+```
+src/app/       composition root — wiring only
+src/shared/    kernel — no feature dependencies
+src/features/  one folder per capability
+```
+
+Entry: `src/extension.ts` → `Startup(config).run(context)` (in `src/app/startup.ts`) which builds the `Container` composition root and registers commands, code actions, and optional syntax highlighting.
+
+**Dependency injection.** `Container` (`src/app/container.ts`) implements the `JournalController` interface and constructs the full service graph in **one pass**: its constructor takes `(configSource, loggerFactory)` and builds `Configuration`, `Inject`, `Parser`, `Dialogues`, `Writer`, `Reader`, `JournalEvents` in dependency order (no two-phase `initServices`, no `!` fields). Commands/providers receive the `JournalController` interface (never the concrete `Container`); only `src/app/` instantiates it. Service interfaces live in `src/shared/model/interfaces.ts` (`IConfiguration`, `ILogger`, `IParser`, `IWriter`, `IReader`, `IInject`, `IDialogues`, `IFileSystem`, `IJournalEvents`). `src/app/register.ts` does the command/provider registration.
 
-**Namespace barrel imports.** `src/index.ts` re-exports submodules as `J.VSCode`, `J.Journal`, `J.Model`, `J.Util`, `J.Commands`, `J.UI`, `J.Features`. Existing code does `import * as J from '..'` and references `J.Util.Ctrl`, `J.Journal.Writer`, etc. `docs/PLAN.md` Phase 2.3 marks this for replacement with named imports — prefer named imports in new files.
+**Named imports only.** The old `J.*` namespace barrel was removed in #234 — `src/index.ts` is empty (`export {}`). Import named symbols directly from submodule barrels / files.
 
 **Module responsibilities** (need multiple files to grasp):
 
-- `src/vscode/` — VS Code surface integration. `Configuration` (`conf.ts`) reads `journal.*` settings and resolves templates/scopes. `Dialogues` drives QuickPick/InputBox. `Startup` wires everything. i18n uses `vscode.l10n` — manifest strings in `package.nls.json` (English-only); runtime strings in `l10n/bundle.l10n.json`. Per-locale `package.nls.<loc>.json` and `l10n/bundle.l10n.<loc>.json` were removed in 1.1.0 (audience is English-speaking; vscode falls back to the default bundle for any locale).
-- `src/journal/` — Core domain logic, no direct command bindings.
-  - `Parser` — turns user input/URIs into structured `Input` (date, note, memo, task, weekly).
-  - `Reader` — loads entries/notes from the configured base directory using `vscode.workspace.fs`.
-  - `Writer` — creates new files (entry, note, weekly) and opens text documents.
-  - `Inject` — modifies existing documents (insert memo/task/file link, shift task).
-  - `MatchInput` (smart-input resolver) — moved here from the old `src/provider/features/`.
-  - `paths.ts` — date-from-URI path utilities (moved here from `src/util/`).
-  - `template-engine.ts` — `resolveDate(template, date, locale?)` and `toMomentFormat(template)`. Single `TEMPLATE_VARIABLE_MAP` registry; use these instead of anything from `dates.ts`. Custom `${d:fmt}` capture group includes the `d:` prefix — strip with `.slice(2)` to get the format string.
-- `src/model/` — Plain data types: `Input`, `FileEntry`, `HeaderTemplate`/`InlineTemplate`/`ScopedTemplate`, scope/quickpick types.
-- `src/commands/` — one file per registered command (`journal.today`, `journal.note`, `journal.printDuration`, etc.); each exports a static `create(ctrl)` that returns the `Disposable`.
-- `src/ui/` — VS Code UI providers.
-  - `codeactions/` — markdown code actions for completed and open task lines.
-  - `codelens/` — task migration/shift CodeLens providers (not all registered yet — see `Startup.registerCodeLens`).
-- `src/features/` — reusable cross-cutting building blocks.
-  - `entries/` — `ScanEntries` (directory walker + cache for QuickPick).
-  - `sync/` — `SyncNoteLinks`, `SyncDailyLinks`.
-  - `LoadNotes` and other higher-level feature helpers.
-- `src/util/` — `Ctrl`, `Logger` (OutputChannel-backed), `dates.ts` (ISO week + locale helpers only; template replacement functions removed in #211), `strings.ts`. Note: `paths.ts` moved to `src/journal/paths.ts`.
-
-**Smart-input flow.** User triggers `journal.day` (`Ctrl+Shift+J`) → `Dialogues` shows InputBox → `MatchInput.parseInput()` classifies the text (date expression, weekday, "memo:", "task:", "note ...", week reference) → command dispatches to `Reader`/`Writer`/`Inject`. The default path/file patterns (`${base}/${year}/${month}/${day}` for notes, `${base}/${year}/${month}/${day}.${ext}` for entries) come from `journal.patterns` in `package.json`.
+- `src/shared/` — the kernel, no feature dependencies:
+  - `config/` — `Configuration` (`configuration.ts`) is a thin `IConfiguration` facade composing `SettingsReader` (scalar settings, base paths, scopes), `PathResolver` (entry/note/weekly path & file patterns), `TemplateProvider` (header/inline/time templates). `patterns.ts` holds the pattern types + defaults.
+  - `model/` — plain data types: `Input`, `FileEntry`, `HeaderTemplate`/`InlineTemplate`/`ScopedTemplate`, scope/quickpick types, and all service interfaces (`interfaces.ts`).
+  - `fs/` — `IFileSystem` impl `VscodeFileSystem` + `fileExists`.
+  - `logging/` — `Logger`/`ConsoleLogger` (OutputChannel-backed).
+  - `dates/`, `strings/`, `lang.ts` — date (ISO week/locale), string, and primitive helpers.
+  - `templates/template-engine.ts` — `resolveDate(template, date, locale?)` and `toMomentFormat(template)`. Single `TEMPLATE_VARIABLE_MAP` registry. Custom `${d:fmt}` capture group includes the `d:` prefix — strip with `.slice(2)`.
+  - `paths.ts` — date-from-URI path utilities (`getDateFromURIAndConfig`, `getWeekFromURIAndConfig`, `resolvePath`, `inferType`).
+  - `events/` — `JournalEvents`, a typed `vscode.EventEmitter` bus for cross-feature signals (e.g. `entryOpened`).
+- `src/features/<feature>/` — each owns its `commands/` (one file per registered command, each exports a static `create(ctrl)` returning a `Disposable`), domain logic, and `ui/` providers:
+  - `entries/` — entry/weekly `Reader`/`Writer`/`Inject`, `ScanEntries` (QuickPick walker+cache), the `show-entry-for-*` commands, and the shared `AbstractLoadEntryForDateCommand`.
+  - `notes/` — `show-note` command, `LoadNotes`, `SyncNoteLinks`.
+  - `weekly/` — `WeeklyEntryWatcher`, `SyncDailyLinks` (subscribes to `entryOpened`).
+  - `tasks/` — task code actions + migrate/shift CodeLens, `copy-task`.
+  - `navigation/` — prev/next entry commands + `navigation.ts`.
+  - `smart-input/` — `MatchInput`, `Parser`, `Dialogues` (QuickPick/InputBox).
+  - `tools/` — `print-time` / `print-duration` / `print-sum` / open-workspace.
+- A feature must not import another feature's internals — cross-feature signals go through `shared/events/`. (Three legacy edges remain pending #239.)
+
+**Smart-input flow.** User triggers `journal.day` (`Ctrl+Shift+J`) → `Dialogues` shows InputBox → `MatchInput.parseInput()` classifies the text (date expression, weekday, "memo:", "task:", "note ...", week reference) → command dispatches via the `JournalController` to `Reader`/`Writer`/`Inject`. The default path/file patterns (`${base}/${year}/${month}/${day}` for notes, `${base}/${year}/${month}/${day}.${ext}` for entries) come from `journal.patterns` in `package.json`.
 
 **Filesystem.** Always go through `vscode.workspace.fs` (the extension declares `extensionKind: ["workspace"]` so it runs on the remote host for Remote SSH/Codespaces). Avoid raw `fs` / `fs.promises` in new code — `docs/PLAN.md` Phase 1.3 finished migrating the old `fs` call sites; do not reintroduce them.
 
@@ -96,9 +103,9 @@ Entry: `src/extension.ts` → `Startup(config).run(context)` (in `src/vscode/sta
 
 ## Reusable building blocks
 
-- `J.Util.fileExists(uri)` (`src/util/fs-exists.ts`) — stat-first existence check; converts `FileSystemError.FileNotFound` to `false`, re-throws others. Use instead of "open and catch the rejection".
-- `AbstractLoadEntryForDateCommand` (`src/commands/show-entry-for-date.ts`) — new "open a specific date" commands should extend it and call `this.execute(input)` with `input.offset` set. Reuses the local-vs-remote prompt and `loadPageForInput` plumbing.
-- `getDateFromURIAndConfig` (`src/journal/paths.ts`) — parses a `Date` from a journal entry file path. Anchor detection for navigation features.
+- `fileExists(fs, uri)` (`src/shared/fs/fs-exists.ts`) — stat-first existence check; converts `FileSystemError.FileNotFound` to `false`, re-throws others. Use instead of "open and catch the rejection".
+- `AbstractLoadEntryForDateCommand` (`src/features/entries/commands/show-entry-for-date.ts`) — new "open a specific date" commands should extend it and call `this.execute(input)` with `input.offset` set. Reuses the local-vs-remote prompt and `loadPageForInput` plumbing.
+- `getDateFromURIAndConfig` (`src/shared/paths.ts`) — parses a `Date` from a journal entry file path. Anchor detection for navigation features.
 - `vscode.Uri.joinPath` for composing FS URIs. `vscode.workspace.fs.readDirectory` returns `[name, FileType][]`.
 
 ## i18n

docs/PLAN.md

@@ -70,12 +70,11 @@ Make sure that, when running on a remote host, the extension can still access th
 - [x] Update barrel `src/index.ts`: `J.Extension` → `J.VSCode`, `J.Actions` → `J.Journal`, `J.Provider` → `J.Commands` / `J.UI` / `J.Features`
 - [x] Update all import paths and barrel-key consumer sites throughout the codebase
 
-### 2.1 — Replace Service Locator with Dependency Injection
-- [ ] Define interfaces for each service: `IConfiguration`, `IDialogues`, `IParser`, `IReader`, `IWriter`, `IInject`, `ILogger`
-- [ ] Remove `Ctrl` and use constructor injection
-- [ ] Each class receives only the interfaces it depends on (not the full `Ctrl`)
-- [ ] Rewrite all tests to use dependency injection, make sure you achieve high test coverage
-- [ ] This enables proper unit testing with mocks
+### 2.1 — Replace Service Locator with Dependency Injection ✓ COMPLETE (#234 Phase 2, #236)
+- [x] Define interfaces for each service: `IConfiguration`, `IDialogues`, `IParser`, `IReader`, `IWriter`, `IInject`, `ILogger` (`src/shared/model/interfaces.ts`)
+- [x] Remove `Ctrl` service-locator; introduce `src/app/Container` composition root (single-pass ctor + logger factory, no two-phase `initServices`/`!`)
+- [x] Consumers depend on the `JournalController` interface (not the concrete controller). Per-command minimal interfaces deferred — facade interface chosen to limit churn (maintainer decision on #234)
+- [x] Tests construct `new Container(cfg, () => logger)`; mocks satisfy `JournalController`
 
 ### 2.2 — Eliminate `new Promise()` Anti-Pattern
 - [ ] Refactor ~25 methods that wrap their body in `new Promise()` to use native `async/await`
@@ -91,10 +90,10 @@ Make sure that, when running on a remote host, the extension can still access th
 - [ ] Validate that async/await is used throughout complete codebase
 - [ ] Validate error propagation through unit tests
 
-### 2.3 — Replace `import * as J from '..'` Pattern
-- [ ] Replace namespace-style imports with explicit named imports
-- [ ] This improves tree-shaking, readability, and IDE support
-- [ ] Example: `import { Ctrl } from '../util/controller'` instead of `J.Util.Ctrl`
+### 2.3 — Replace `import * as J from '..'` Pattern ✓ COMPLETE (#234 Phase 1, #235)
+- [x] Replaced namespace-style imports with explicit named imports across all files
+- [x] Root `src/index.ts` barrel emptied (`export {}`) — broke the root import cycle
+- [x] Improves tree-shaking, readability, and IDE support
 
 ### 2.4 — Modernize Activation
 - [x] Remove explicit `activationEvents` from `package.json` (VS Code 1.74+ supports implicit activation from `contributes.commands`)
@@ -106,12 +105,27 @@ Make sure that, when running on a remote host, the extension can still access th
 - [ ] Use `contributes.grammars` (already partially in place) and optional `contributes.themes` for color customization
 - [ ] Provide a dedicated color theme as an optional install instead of injecting TextMate rules
 
-### 2.6 — Decouple Configuration
-- [ ] Extract configuration reading into a dedicated service with caching and change detection
-- [ ] Use `vscode.workspace.onDidChangeConfiguration` to invalidate cache
-- [ ] Remove deprecated `getInlineTemplateCached()` method
-- [ ] Remove legacy `tpl-*` setting support (they've been deprecated since pre-1.0)
-- [ ] Type the return of `getWeekFilePattern()` and `getWeekPathPattern()` (currently `any`)
+### 2.6 — Decouple Configuration ◐ PARTIAL (#234 Phase 3, #237)
+- [x] Split the 700-line `Configuration` god-class into `SettingsReader` / `PathResolver` / `TemplateProvider` (`src/shared/config/`); `conf.ts` → ~105-line `IConfiguration` facade
+- [x] Removed `getInlineTemplateCached()` (dropped with the old `TemplateService`)
+- [x] Typed the return of `getWeekFilePattern()` / `getWeekPathPattern()` (`Promise<ScopedTemplate>`)
+- [ ] Add caching + `vscode.workspace.onDidChangeConfiguration` invalidation (still reads live each call)
+- [ ] Remove legacy `tpl-*` setting support (deprecated since pre-1.0)
+
+### 2.7 — Package-by-feature restructure (#234) ◐ Phases 1–4 done, Phase 5 open
+Spec: [docs/specs/2026-06-02-234-package-by-feature.md](specs/2026-06-02-234-package-by-feature.md) · Plan: [docs/plans/2026-06-02-234-package-by-feature.md](plans/2026-06-02-234-package-by-feature.md)
+
+Source moved from package-by-layer to **package-by-feature**:
+```
+src/shared/    kernel — model, config, fs, logging, dates, strings, templates, paths, events, lang
+src/features/  entries, notes, weekly, tasks, navigation, smart-input, tools
+src/app/       composition root (Container / register / startup)
+```
+- [x] Phase 1 (#235): kill `J` barrel → named imports
+- [x] Phase 2 (#236): `Ctrl` → `app/Container` DI
+- [x] Phase 3 (#237): split `Configuration`
+- [x] Phase 4 (#238): feature folders + `shared/events/` (`entryOpened` replaces inline weekly sync)
+- [ ] Phase 5 (#239): vscode-free `domain/` via `shared/editor/` adapter; remove the 3 remaining cross-feature edges (`entries→notes`, `navigation→entries`, `smart-input→entries`)
 
 ---