docs(readme): rewrite hero per launch-plan V1 audit

[naorsabag]

Summary

Closes two of the three V1 "fresh-eyes audit" findings from openhop-launch/03-readme-and-landing.md:

• Passive tagline → active voice. "Animated diagrams your AI agent can write" assumed the reader already knew what an "agent" did. Replaced with the doc's skeleton tagline "Your AI walks you through your code, one step at a time" + a one-line descriptor.
• Broken #install anchor in the NOTE block repointed to #install-options so the in-page link actually scrolls.

Also renamed ## Try it in 60 seconds → ## Try it in 30 seconds and updated the matching nav anchor.

Not in this PR (reverted after author review)

• Hero command swap (init → demo). Initially included per the doc's "don't lead with install instructions" Do, but reverted on author preference — install-first is intentional here.

Deferred (separate follow-up PRs)

• Quantified claim block (~Nx fewer tokens) — needs a measured ratio + docs/token-comparison.md worked example.
• #262626 custom badges — V3 dark-mode finding.
• Self-referential OpenHop-of-OpenHop diagram — V1 dogfood opportunity that replaces the mermaid How it works block.

Test plan

• All in-page anchors resolve — verified statically.
• CI green on the new branch.
• Manual read-through on github.com renders correctly.

🤖 Generated with Claude Code

[coderabbitai]

Walkthrough

This PR updates the README to refocus marketing messaging on the AI-driven step-by-step code walkthrough experience and replaces the 60-second quickstart with a streamlined 30-second demo workflow using npx openhop demo and npx openhop init commands.

Changes

README Marketing & Quickstart Update

Layer / File(s)	Summary
Hero Copy & Value Proposition README.md	Hero text rewritten to emphasize "Your AI walks you through your code, one step at a time" with animated, multi-level YAML-described data flows.
Navigation Link Update README.md	Quickstart navigation link updated to point to the new 30-second quickstart anchor.
Quickstart Section Expansion README.md	60-second quickstart replaced with 30-second demo workflow: npx openhop demo command, expanded description of spawning locally, OAuth flow, and live animation, added npx openhop init setup instructions, and updated NOTE about auto-detecting supported agent clients.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• naorsabag/openhop#124: Both PRs modify README.md hero/navigation and install/quickstart content with overlapping documentation edits to the same README sections.
• naorsabag/openhop#88: Both PRs rework the 60s→30s quickstart, navigation/heading/quickstart wording, and demo/init instructions.
• naorsabag/openhop#87: Both PRs modify README prose and navigation for project marketing, quickstart, and how the agent emits YAML/animated flows.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: rewriting the README hero section based on the V1 launch audit, which is the primary objective of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-v1-hero-fixes

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