INTENT-2 v2: .prompt {{name}} substitution + .dialog dual-brace, drop comment exception

[JarbasAl]

What

Breaking reinterpretation of brace handling in .prompt and .dialog. The implementation already landed in ovos-spec-tools #38; this PR is the matching spec text.

Sections changed (intent-2.md)

• §4.2 (.dialog) — flips the old "single-brace {name} only; no {{ }} form" restriction: .dialog now recognizes both {name} and {{name}} per OVOS-INTENT-1 §3.4, treating them identically.
• §4.4 (.prompt):
  • The substitution variable is now {{name}} (double-brace only). A single {name}, a lone {/}, and literal JSON/markup ({}, { }, {"key": 1}) pass through unchanged. This is why prompts require double-brace — they routinely contain literal single braces.
  • The author-comment exception is removed entirely: a .prompt has no comment handling; <!-- … --> is literal text. The only special handling a .prompt receives is {{name}} substitution.
  • The prior fenced-code-block substitution rule is dropped (a single-brace {name} is already literal everywhere, so the carve-out is moot).
  • Worked example updated: {{query}} is substituted; the <!-- … --> line and single-brace {response} survive verbatim.
  • See-also line updated from {name} to {{name}}.
• CHANGELOG.md — new OVOS-INTENT-2 ### 2 section describing the breaking .prompt/.dialog brace changes.
• README.md — OVOS-INTENT-2 class column 1 → 2.

Version (triple-match)

Breaking (reinterprets previously-literal {{ }}; drops comment-stripping) → bump to Version 2:

• header **Version:** 2
• CHANGELOG ### 2 under OVOS-INTENT-2
• README class column 2

Dangling-reference check

Removing the comment exception left no dangling references inside .prompt content. The only stale mention — the See-also "verbatim text with optional {name} substitution only" — was updated to {{name}}. The §3 common-reader #-comment rule is unrelated (it governs line-oriented files; .prompt is read whole and is explicitly exempt).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2c641d09-489a-4ca9-a539-1f1614243b94

📥 Commits

Reviewing files that changed from the base of the PR and between b7e16b9 and 384a426.

📒 Files selected for processing (3)

• CHANGELOG.md
• README.md
• intent-2.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch spec/intent-2-prompt-double-brace

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