Emit OSC 8 terminal hyperlinks from WriteLink via Spectre Markup

[Copilot]

✨ Enhancement

Inline links rendered by ConsoleRendererBase.WriteLink (covering both LinkInline and AutolinkInline) now emit Spectre.Console's [link=...]...[/] markup, producing OSC 8 terminal hyperlinks in capable terminals. Previously links were only discoverable via the post-render numbered menu.

Implementation approach:

• DisplayOptions.UseTerminalHyperlinks — new opt-out bool (default true); added to Clone().
• ConsoleRendererBase.WriteLink — when the option is enabled and the URL is non-empty, wraps the emitted link text with [link={Markup.Escape(url)}]...[/]. URL is escaped so URLs containing [/] don't break Spectre's markup parser. No-op when URL is empty (e.g. [](path) reference-style cases) to avoid emitting an empty hyperlink target.

var useHyperlink = Options.UseTerminalHyperlinks && !string.IsNullOrEmpty(url);
if (useHyperlink) AddInLine($"[link={Markup.Escape(url)}]");
// ... existing [text](url) emission ...
if (useHyperlink) AddInLine("[/]");

• Tests — added 5 cases in RendererTests exercising default-on, opt-out, autolink wrapping, bracketed-URL escaping, and Clone() preservation. They use a TestConsole with EmitAnsiSequences = true and Profile.Capabilities.Links = true to assert on the OSC 8 sequences directly.

Existing linkInline / autolinkInline / bracketEscaping golden fixtures required no updates: TestConsole.Output strips the new markup unless link capabilities are explicitly enabled, so the plain-text layout fixtures are unaffected.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.74%. Comparing base (ba02956) to head (f67e96e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   95.71%   95.74%   +0.03%     
==========================================
  Files          29       29              
  Lines        1635     1647      +12     
  Branches      172      175       +3     
==========================================
+ Hits         1565     1577      +12     
  Misses         46       46              
  Partials       24       24              

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