docs: private security reporting; fix the dataset-default line

[easeev]

Two docs fixes before sharing the repo more widely.

• Security reporting (docs/security.md): the Reporting section called Chainplot an internal tool and sent findings to the public issue tracker. It now points to GitHub's private vulnerability reporting (Security tab → Report a vulnerability), which is already enabled on this repository, and keeps the tracker for non-exploitable issues.
• Dataset default (README.md): a sentence ended "which is why the default keeps the data in", contradicting the section above it — the default results_only release ships no dataset. The clause is removed. The "runs offline" line now says it applies once dependencies are installed.

Verified: markdownlint-cli2 reports the same 25 pre-existing line-length findings on both files before and after; no new ones. gh api repos/chainstacklabs/chainplot/private-vulnerability-reporting returns {"enabled":true}.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that the application runs offline once its dependencies are installed.
  • Updated security reporting guidance: report exploitable vulnerabilities privately through the repository’s Security tab; other issues can be reported in the issue tracker.

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• README.md

📝 Walkthrough

Walkthrough

The README now clarifies offline operation requirements and changes a statement about recomputing published data. Security reporting guidance now directs vulnerability reports to the repository’s Security tab.

Changes

README clarifications

Layer / File(s)	Summary
README statements README.md	The recomputation statement is shorter. The offline-operation statement specifies that dependencies must be installed first.

Security reporting guidance

Layer / File(s)	Summary
Vulnerability reporting instructions docs/security.md	The guidance directs reports of exploitable issues to the Security tab, discourages public reporting of those issues, and retains the issue tracker for other reports.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: 🔵 Low · up to a6b1c

Users may attempt remote publishing or an HTTPS fork without a connection based on the README’s offline claim. This is a localized documentation issue; narrow the claim before relying on it.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes both documentation changes: private security reporting guidance and the dataset-default line correction. It is concise and specific.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches 💡 1

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@README.md`:
- Line 304: Update the README offline claim to state that local build and
validation run offline after dependencies are installed, and clarify that remote
publishing and `fork --from https://…` require network access.

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