docs(spanish-copy): verify, archive and merge specs (closes spanish-copy)

[TOMOKI977]

Summary

Closes change spanish-copy. This PR only touches documentation.

• Verify: PASS WITH WARNINGS, with nothing blocking the archive.
  • 870 tests pass and typecheck is clean.
  • All 24 tasks are checked.
  • No English text is visible to users.
• Archive: openspec/changes/spanish-copy/ moves to openspec/changes/archive/2026-09-29-spanish-copy/ with git mv, adding verify-report.md and archive-report.md.
• New main spec: openspec/specs/bot-copy/spec.md, with 5 requirements. Bot-authored text is in Spanish, while page values stay verbatim. The prompt, code and logs stay in English. Replies are plain text within the Telegram cap, and technical codes are never shown raw.
• Modified main spec: openspec/specs/hackathon-analysis/spec.md.
  • Its 8 modified requirements are replaced in place and now quote the Spanish copy. It still has 12 requirements in total.
  • The delta's (Previously: …) annotations are not carried over.

Non-blocking warnings (recorded in verify-report.md)

• W1: no test asserts the exact spec sample "Submissions close June 1".
• W2: no test asserts the BadArgument log code.
• W3: the "Permanecer anónimo" label is an assumption.

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