Add PyMC Labs talk slides

[drbenvincent]

Summary

• Adds Quarto RevealJS slide deck for the PyMC Labs internal talk (docs/dev/pymc_labs_talk.qmd)
• Custom styling via talk_style.scss
• .gitignore entries for Quarto render output (_files/, .html)

Talk structure

The talk walks through a single end-to-end example (training → skill → performance) demonstrating:

1. DSL spec and model construction
2. DAG visualisation and PyMC model introspection
3. Equations and priors
4. MCMC fitting
5. Effects summary and path-specific effects
6. ATE via the do-operator (g-computation)
7. Interventional probability queries
8. Sensitivity analysis for unmeasured confounding
9. Identification checks and implied independence tests

Followed by a summary of additional capabilities (families, panel data, transforms, latent variables, simulation), a comparison table, and roadmap.

Rendering

conda activate pathmc
quarto render docs/dev/pymc_labs_talk.qmd

Test plan

• Render slides locally and verify all executable cells produce output
• Check slide flow and timing
• Review comparison table for accuracy against current feature set

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