Squashage v0.4.0 — yamete-fidelity docs + em-dash cleanup

Squashage v0.4.0

Minor release — bundles mechanism-depth doc expansion, em-dash cleanup, and the last GitHub Actions baseline bump.

Added

• Mechanism-depth expansions across 8 user-facing doc pages (architecture, pipeline, classification-engines, classifier-cascade, configuration, output, plugins, viz) following the yamete-fidelity bar: problem framing, state machines, determinism contract, edge cases. Fixed outdated cytoscape references in usage/viz.md to reflect the sigma + graphology engine since v0.2.0.

Changed

• Em-dashes (—) replaced with plain punctuation (: for list/definition items, ; for clause joins, , mid-sentence) across README.md, docs/**/*.md, package.json, and docs/.vitepress/config.ts. 142 occurrences total.
• actions/checkout 4 → 6 across all workflow files.
• additionally ai-ism removed from docs/architecture.md.

Full changelog: CHANGELOG.md