fix(install): default project dir to CWD and ensure Erlang runtime so the README quick start works

[shaun0927]

Summary

Following the README quick start on a clean machine —

curl -fsSL https://raw.githubusercontent.com/Q00/ourocode/release/bootstrap/install.sh | bash
ourocode

— does not work today. Two release-path bugs break it. This PR fixes both so the documented flow works on any machine.

Bug 1 — hardcoded developer project directory

lib/ourocode/cli/startup_args.ex defaulted the project directory to a build-time absolute path:

@default_project_dir "/Users/jaegyu.lee/Project/ourocode"

On any other machine, running ourocode (or ourocode --smoke-test) without --project-dir fails in resolve_project_dir/1:

ourocode startup failed: project directory does not exist: /Users/jaegyu.lee/Project/ourocode

Fix: default to the current working directory (File.cwd!()), with an OUROCODE_PROJECT_DIR environment override. This matches the README's "Then run: ourocode" contract.

Bug 2 — Erlang/OTP runtime not ensured by the installer

The bundled ourocode is an Erlang escript (#! /usr/bin/env escript) and needs escript/erl on PATH. The release tarball does not bundle the runtime, and install.sh only checks for mix/cargo on the build-from-source path — never on the bundled-release path. So on a fresh machine the installer prints ==> ready, yet every invocation dies with:

env: escript: No such file or directory

Fix: add a best-effort ensure_erlang_runtime step (consistent with the existing best-effort Ouroboros step) that installs Erlang via Homebrew (macOS) or apt/dnf (Linux), and otherwise fails fast with actionable manual instructions. OUROCODE_SKIP_ERLANG=1 bypasses it.

Docs

README.md: document the Erlang/OTP runtime requirement, the installer's handling of it, and the new CWD default / OUROCODE_PROJECT_DIR override.

Changes

File	Change
lib/ourocode/cli/startup_args.ex	default_project_dir/0 → CWD + OUROCODE_PROJECT_DIR override
test/ourocode/cli_test.exs	update the two tests that asserted the hardcoded path
install.sh	ensure_erlang_runtime (best-effort install + fail-fast guidance)
README.md	Requirements section + CWD-default note

Verification

• mix test test/ourocode/cli_test.exs → 46 tests, 0 failures
• bash -n install.sh → syntax OK
• mix format --check-formatted on the edited Elixir files → clean

Note: running the full suite under Elixir 1.19 hits an unrelated pre-existing incompatibility (@type record in lib/ourocode/plugin/config_status.ex collides with the new built-in record/0 type). That is outside this PR's scope; the targeted cli_test.exs run above covers the changed code.

Out of scope

Single self-contained binary (already tracked in the README Status section), Homebrew tap, the separate ouroboros Python installer warnings, and Windows support.

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