Move 24 defcomp definitions from Python string constants in components.py
to 7 grouped .sexp files under shared/sexp/templates/. Add load_sexp_dir()
to jinja_bridge.py for file-based loading. Migrate events and market
link-card fragment handlers from render_template to sexp. Delete 9
superseded Jinja HTML fragment templates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Two-way bridge: sexp() Jinja global renders s-expression components in
templates, register_components() loads definitions at startup. Includes
~link-card component test proving unified replacement of 5 per-service
Jinja fragment templates.
19 new tests (218 total).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>