ref(cli): Give dev/self build targets their own output dirs

[thecodedrift]

What

Each build target now emits to a distinct, gitignored directory so prod, dev, and self builds never overwrite one another:

Command	Output dir	Baked invocation	Use for
pnpm build	dist/	npx @taskless/cli	Production / published builds (default)
pnpm build:dev	dist-dev/	node <abs>/…/dist-dev/index.js	Validating this build from another repo
pnpm build:self	dist-self/	node packages/cli/dist-self/index.js	Dogfooding in this repo

Why

Previously all three targets wrote to dist/, so a build:dev or build:self would clobber the prod artifact (and each other). Splitting the output directories makes the three reliable and independent — you can have a prod build and a self-install build coexisting without re-running.

How

• vite.config.ts maps TASKLESS_BUILD_TARGET to its outDir via a shared OUT_DIRS table that also drives the baked dev/self invocation paths — output location and embedded CLI path stay in sync from one source.
• Prod is unchanged (still dist/), so the published package, pnpm cli, and every test binPath keep working untouched — the diff only adds the two new dirs.
• turbo outputs, .gitignore, eslint ignores, and both tsconfig excludes cover dist-dev//dist-self/.
• README table + the infrastructure spec document the three-target layout.

No changeset: the published artifact is byte-identical (prod still dist/), so this is consumer-invisible build plumbing.

Verification

• pnpm build / build:dev / build:self each land in their own dir with the correct baked invocation string (verified prod=npx @taskless/cli, dev=absolute, self=repo-relative).
• pnpm typecheck, pnpm lint, pnpm test (299 tests) all green.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the CLI build plumbing so the prod/dev/self build targets no longer clobber each other by emitting to separate output directories, while keeping the production artifact unchanged (dist/).

Changes:

• Split CLI build outputs by TASKLESS_BUILD_TARGET into dist/, dist-dev/, and dist-self/ (single source of truth in vite.config.ts).
• Update repo tooling/config to recognize the new output directories (turbo cache outputs, TS excludes, ESLint ignores, gitignore).
• Document the three-target layout in the root README and infrastructure spec.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
turbo.json	Cache build outputs for dist-dev/** and dist-self/** in addition to dist/**.
tsconfig.json	Exclude new build output directories at the repo root.
README.md	Document per-target output directories and updated baked invocation paths.
packages/cli/vite.config.ts	Centralize target→outDir mapping and ensure baked dev/self invocations point at the correct output dir.
packages/cli/tsconfig.json	Exclude new CLI build output directories.
package.json	Update build:self:install to run from dist-self/ output.
openspec/specs/infrastructure/spec.md	Update infrastructure spec to reflect cached build outputs.
eslint.config.js	Ignore new output directories.
.gitignore	Ignore dist-dev/ and dist-self/ outputs.

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