Fix continuous DiD tutorial formatting

[igerber]

Summary

• Escape dollar signs ($7, $11, $2) in cell 14 markdown to prevent Jupyter from rendering currency amounts as LaTeX
• Split chart cell 27: remove print() statements after plt.show() and add a new markdown cell for the explanatory text

Methodology references (required if estimator / math changes)

• N/A — no methodology changes (tutorial formatting only)

Validation

• Tests added/updated: No test changes
• Backtest / simulation / notebook evidence: Notebook executed end-to-end via nbconvert — all cells pass, outputs cleared

Security / privacy

• Confirm no secrets/PII in this PR: Yes

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Generated with Claude Code

[github-actions]

Overall Assessment: ✅ Looks good

Executive Summary

• Formatting-only edits in docs/tutorials/14_continuous_did.ipynb (escaped $ in markdown and moved explanatory text to a markdown cell), no estimator logic or outputs changed.
• Methodology registry cross-check not applicable because there are no changes to estimators, math, weighting, or inference.
• No tests updated or required for this change set.

Methodology

• Severity: P3 | Impact: None; tutorial markdown formatting only, no estimator or identification changes (docs/tutorials/14_continuous_did.ipynb:L299-L307, docs/tutorials/14_continuous_did.ipynb:L561-L574) | Concrete fix: None.

Code Quality

• Severity: P3 | Impact: None; removal of print() after plt.show() in a notebook cell improves output cleanliness, no logic change (docs/tutorials/14_continuous_did.ipynb:L619-L637) | Concrete fix: None.

Performance

• Severity: P3 | Impact: None; no runtime logic changes | Concrete fix: None.

Maintainability

• Severity: P3 | Impact: None; explanatory text moved to markdown cell improves readability, no code impact (docs/tutorials/14_continuous_did.ipynb:L625-L641) | Concrete fix: None.

Tech Debt

• Severity: P3 | Impact: None; no new debt introduced | Concrete fix: None.

Security

• Severity: P3 | Impact: None; no secrets or sensitive data introduced | Concrete fix: None.

Documentation/Tests

• Severity: P3 | Impact: None; docs-only change, tests not required | Concrete fix: None.

If you want a deeper pass (e.g., validating notebook execution metadata or output clearing), point me at the full notebook JSON and I’ll check it.