Add Sealed Delegation and drop three-paths framing

[jennyf19]

Summary

• Add Sealed Delegation as a homepage card + nav link to the public research preview
• Soften hero from "Three paths..." to open-ended "Patterns for agents that learn"
• Mirror the section in README and note it in CHANGELOG

Why

Sealed Delegation is now public: https://github.com/jennyf19/sealed-delegation
JM validated the package; onboarding docs were reworked for human-first reading.

Test plan

• Preview Pages after merge
• Confirm sealed-delegation card links out correctly
• Confirm hero no longer says three paths

[Copilot]

Pull request overview

This PR updates the public-facing docs/site copy to introduce Sealed Delegation as a first-class pattern and removes the “three paths” framing in favor of more open-ended “patterns” language.

Changes:

• Add Sealed Delegation as a homepage card and nav link (external link to the GitHub repo).
• Update homepage hero/meta copy from “Three paths…” to “Patterns for agents that learn.”
• Mirror the Sealed Delegation section in README.md and record the change in CHANGELOG.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Adds a new Sealed Delegation section aligned with the homepage phrasing and link target.
index.html	Updates meta/hero/nav copy and adds a Sealed Delegation card + nav link.
CHANGELOG.md	Documents the Sealed Delegation addition and the hero framing change as part of 0.4.0.

Suppressed comments (3)

index.html:59

• The hero title and lede paragraph are over-indented relative to the rest of the hero block. This looks accidental and reduces readability.

            <h1 class="title">Patterns for agents that <span class="grad">learn</span>.</h1>
            <p class="lede">Agentic DevOps is for teams building with AI agents <strong>as collaborators, not automation</strong>. Skills, feedback loops, workshops, and sealed local delegation — pick the pattern that matches the work in front of you.</p>

index.html:69

• The primary CTA link is indented inconsistently within the .cta-row, which makes the markup harder to scan and maintain.

              <a class="btn btn-primary" href="#paths">Browse the patterns

index.html:167

• The new Sealed Delegation card block is indented much deeper than the other cards. Reformatting it to match the existing indentation style will improve maintainability and avoid unnecessary whitespace churn in future edits.

                <div class="card">
                  <div class="ico" aria-hidden="true">
                    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="3" width="16" height="18" rx="2"/><path d="M8 8h8M8 12h8M8 16h5"/><path d="M15 14l3 2-3 2"/></svg>
                  </div>
                  <div class="quote">"I want a local model on one sealed job"</div>

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