fix(bootstrap): skip hosts with no published bootstrap instead of failing

[benceruleanlu]

Part of a stack of review fixes for #1486. Based on #1506.

Summary

detectPlatform now throws on Linux ARM64, and both dev hooks call it unconditionally. pnpm run init, which is pnpm install && pnpm run bootstrap and the command the README gives new contributors, dies with a stack trace on that host after installing. pnpm run dev:bootstrap dies the same way before Electron starts, and predev points the developer at pnpm run bootstrap, the command that throws.

A host with no published bootstrap is a fact rather than an error: the app falls back to system git.

Feature behavior

detectPlatform returns null for such hosts, and every mode reports the situation and exits 0. The script gains the two modes the hooks needed, --check to warn only and --if-missing to build when absent, so both package.json one-liners now just call it. The host-to-directory mapping each of them had copied lives only in detectPlatform.

An explicit --platform naming an unknown target still fails, so release builds, which always pass --platform, cannot silently skip.

Test coverage and validation

Exercised the script with process.platform and process.arch stubbed:

• linux/arm64 under --check, --if-missing and no flag: prints "No bootstrap python is published for linux arm64" and exits 0.
• darwin/arm64 with the directory absent under --check: prints the same warning as before and exits 0.
• darwin/arm64 with the directory present: --check and --if-missing are silent, exit 0, and leave the directory untouched.
• An explicit unknown --platform still exits non-zero.

Full unit suite: 274 files, 4736 passed, 2 skipped. Typecheck, lint and format pass. README updated for the skip.

Change breakdown

Total changed lines: 46 (37 added, 9 deleted).

Product code

• 1 files; +34 / -6; 40 changed lines; 87.0% of total.
• scripts/build-bootstrap-python.mjs

Test code

• 0 files; +0 / -0; 0 changed lines; 0%.

Documentation

• 1 files; +1 / -1; 2 changed lines; 4.3% of total.
• README.md

Configuration and CI

• 1 files; +2 / -2; 4 changed lines; 8.7% of total.
• package.json

Generated files

• 0 files; +0 / -0; 0 changed lines; 0%.

Lockfiles

• 0 files; +0 / -0; 0 changed lines; 0%.

Vendored code

• 0 files; +0 / -0; 0 changed lines; 0%.

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Reviewing files that changed from the base of the PR and between 2b9c6a5 and 4cb1068.

📒 Files selected for processing (3)

• README.md
• package.json
• scripts/build-bootstrap-python.mjs

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