fix(js): accept positional CLI URL arguments

[konard]

Summary

Fixes #68.

The JavaScript CLI now accepts capture URLs as positional arguments while keeping yargs strict option validation enabled.

Root Cause

js/bin/web-capture.js enabled .strict() without declaring the URL positional argument. yargs rejected web-capture https://example.com as an unknown argument before main() could run. The code also looked for config._[0], but lino-arguments drops yargs' _ array from the returned config object, so separator-based inputs like -- https://example.com could not be recovered there either.

Changes

• Declared the default yargs command as $0 [url] so strict mode accepts the URL positional.
• Read the parsed config.url field and added a narrow fallback for URLs passed after the -- separator.
• Marked --output / -o with nargs: 1 so documented stdout output forms like --output - keep working under strict mode.
• Added CLI regression tests for positional URLs, -- separator URLs, unknown-option rejection, and immediate invalid-URL validation.
• Added a patch changeset for the JS package.

Reproduction and Regression Coverage

Before this fix, the new CLI tests failed for both:

web-capture http://127.0.0.1:<port>/article --format markdown --output -
web-capture --format markdown --output - -- http://127.0.0.1:<port>/article

After the fix, both forms capture content successfully, and strict mode still rejects unknown options.

Verification

• npm test -- tests/unit/cli.test.js passes.
• npm test -- tests/unit passes: 207 tests.
• npm test -- --testPathIgnorePatterns="docker.test.js" passes: 245 tests, 16 skipped live Habr tests.
• npm run lint passes with existing warnings only.
• npm run format:check passes.
• npm run check:duplication passes.
• node scripts/validate-changeset.mjs passes.
• Manual smoke test for --capture api --archive zip -- URL produced a non-empty ZIP.

Docker-specific tests were not run locally because Docker is not installed in this environment.

[konard]

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[konard]

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[konard]

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[konard]

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