Group the sources into aliased modules and lint with the published plugins (#23)

Groups the flat `src/` into cohesive modules and turns on the published lint plugins. No behavior change.

## Module layout

Each module is a direct `src/` subfolder with an `index.ts` barrel and a `#` alias in `package.json` `imports` (layer order, top first):

| Alias | Files |
| --- | --- |
| `#prepare` | `index.ts` (the prepare phase entry point) |
| `#run` | `index.ts` (the run phase entry point) |
| `#post` | `index.ts` (the post phase entry point), `post.ts`, `post.test.ts` |
| `#agents` | `auth.ts`, `opencode.ts` (Codex / Claude Code sign-in, OpenCode args and output) |
| `#processes` | `child.ts`, `isolation.ts` |
| `#runtime` | `runtime.ts`, `credentials.ts` |
| `#profiles` | `profiles.ts` |
| `#common` | `errors.ts`, `json.ts` |
| `#testing` | `index.ts` (unchanged) |

Every top-level entry of `src/` is an aliased module folder. Tests stay next to their code as `*.test.ts`. Each phase's `index.ts` is its entry point, and `action.yml` now runs `node src/<phase>/index.ts`. The post phase's logic moved to `src/post/post.ts` so its test can import it; `index.ts` keeps the env reading and the `import.meta.main` call. `run`'s prompt URL is now `../../prompt.md`. `scripts/protect-source.sh` now copies `src/` recursively (it used to copy `src/*.ts` only), and the workflow test checks that module files get staged too.

## Lint plugins

- New devDependencies: `eslint-plugin-explicit-types@^0.6.1` and `eslint-plugin-import-structure@^0.10.2`, both in `jsPlugins`. The lockfile comes from a real `npm install`.
- Enabled configs: `importStructure.configs.modules`, `explicitTypes.configs.concrete`, `explicitTypes.configs.absence`.
- **explicit-types `naming` is off** (the other app repos turn it on). Its `upper-snake-string-unions` and `no-upper-snake-object-keys` rules fire on wire tokens this repo doesn't choose: profile types `"claude" | "codex" | "opencode"` from `profiles.json`, failure reasons posted to Gitea, Gitea's `"new" | "old"` side, and environment variable names such as `PATH`. Satisfying them would change behavior or need opt-outs. This is logged as an open question for the user.

Lint fixes, all type-level:
- `Pick<BotProfile, "type" | "model">` became a named `ProfileIdentity` interface that `BotProfile`, `ProfileFailure`, and `RuntimeProfile` extend. `RuntimeOutcome` is now `RuntimeSuccess | RuntimeFailure`.
- Inline object types became named interfaces.
- `Record<string, string>` env maps became `NodeJS.ProcessEnv`. `JsonObject` and the verdict table became `NodeJS.Dict<…>`.
- `T | undefined` locals and returns became `T | null` with matching checks. `typeof fetch` became a `Fetcher` type.
- Claude's result fields are held in camelCase (`isError`, `apiErrorStatus`) after parsing, because `id-match` rejects snake_case interface members.
- Duplicate import sources are merged (`import-structure/no-duplicate-import-source`).

## Verification

- `vp check`: clean.
- `vp test`: 61 passed and 5 skipped as a normal user. All 66 passed as root in `node:24-bookworm`.
- Each phase (`node src/<phase>/index.ts`) run from a `protect-source.sh` copy loads its full alias graph under Node.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #23
Reviewed-by: bot <noreply@capsulizers.com>
Co-authored-by: Danny Kim <temeddix@gmail.com>
Co-committed-by: Danny Kim <temeddix@gmail.com>

AGENTS.md

@@ -20,7 +20,7 @@ dependency. Keep the sources to erasable syntax and `.ts` imports, which
 `exactOptionalPropertyTypes` off
 ([.agents/memory/ts-only-files-and-imports.md](.agents/memory/ts-only-files-and-imports.md)).
 Checks use Vite+: `vp check` formats, lints, and type-checks, and `vp test`
-runs Vitest. Unit tests sit next to the code as `src/*.test.ts`;
+runs Vitest. Unit tests sit next to the code as `*.test.ts` in `src/`;
 repository-level tests live in `tests/`.
 
 A `#` alias in `package.json` `imports` may point anywhere and owns its
@@ -34,9 +34,16 @@ import is banned in every file, owned or not
 (`import/no-relative-parent-imports`); runtime file URLs such as
 `new URL("../prompt.md", import.meta.url)` are paths, not imports, and stay.
 Files no alias owns need no `index.ts` and no alias, and import `./` siblings
-and subfolders freely. The one alias is `#testing` (`./src/testing/index.ts`):
-tests that use its helpers import it by alias, and `tests/` imports `src/`
-only through it. Local convention, stricter than the general rule above: in
+and subfolders freely. Every top-level entry of `src/` is an aliased module
+folder. The aliases, in layer order, are the three phases `#prepare`, `#run`,
+and `#post`, then `#agents` (Codex,
+Claude Code and OpenCode specifics), `#processes` (child processes and the
+isolated profile users), `#runtime` (the prepared runtime and its
+credentials), `#profiles`, `#common` (error and JSON checks), and `#testing`
+(test helpers), each with a `src/<name>/index.ts` barrel. A phase's
+`index.ts` is also its entry point, which `action.yml` runs as
+`node src/<phase>/index.ts`. Tests that use the test
+helpers import `#testing`, and `tests/` imports `src/` only through it. Local convention, stricter than the general rule above: in
 this repo, aliases point only at a direct subfolder of `src/`
 (`"#helpers": "./src/helpers/index.ts"`), and code outside `src/` uses `./`
 relative imports. `scripts/` is flat: one file per tool, no subfolders and no `index.ts`, imported directly by file path