fix(1c) keep inline query parameters out of metadata

[alencristen]

Resolves #4226.

Changes

Only match # and & directives at the start of a line, so inline 1C query parameters do not consume the rest of the line. Includes a regression fixture.

Checklist

• Added markup tests
• Updated the changelog

[Baltsat]

I tested exact head e187cecea08e61db524f9ddee497784ee2597695 against base 29dc139fa8d8bcf14bcae6b4f8323027eca9eed3.

With only the two new fixtures applied to the unpatched base, the focused 1C markup test fails exactly on the inline &НачалоПериода parameter being consumed by META through end of line. On this PR head:

• npm run build passes
• ONLY_LANGUAGES=1c npm run test-markup passes (3 passing)
• npm run lint-languages passes
• npm run lint passes with the existing ignored vendor warning
• npm test passes (1582 passing, 3 pending)

The existing fixture for indented &НаКлиенте... directives also remains green, so the start-of-line behavior is preserved while inline query parameters stop being classified as metadata. I found no code-level blocker.

GitHub currently reports a conflict with main; a local merge-tree check shows the conflict is limited to CHANGES.md. Please rebase or resolve that changelog conflict and rerun the checks.