feat(slides): correctness fixes, coverage adds, fit-title polish

[codebytes]

Summary

Three queued slide PRs (#39 correctness / #40 coverage / #41 polish) merged into a single change to keep the deck self-consistent. All against main, single-author, no demo or color changes.

🔴 Correctness (was queued as #39)

Agent-Ready CLI slide rewritten to match aspire.dev:

• Setup is aspire agent init, not aspire run.
• Transport is stdio (aspire agent mcp spawned as a subprocess). The previous slide invented an http://localhost:15889/mcp URL — that doesn't exist for the CLI MCP server.
• Now distinguishes the CLI MCP server (stdio + skill files) from the Dashboard MCP server (streamable HTTP + API key, exposed via the dashboard top-right MCP button).
• Officially supported clients per docs: VS Code, Claude Code, GitHub Copilot CLI, OpenCode.
• Real .vscode/mcp.json shape included.

Sources: aspire.dev/get-started/aspire-mcp-server/, aspire.dev/get-started/ai-coding-agents/.

AppHost Languages slide rescoped:

• Per aspire.dev/languages-and-runtimes/, only C# and TypeScript are documented AppHost authoring languages today.
• Removed the Python/Java/Go "experimental" stubs (not on the live docs site).
• Workload language support is covered separately and accurately via AddProject, AddJavaScriptApp, AddPythonApp, AddDockerfile, AddContainer, AddExecutable. Aspire Type System (ATS) called out as the bridge.

🟡 Coverage (was queued as #40)

New slide: "Standalone Dashboard — No AppHost Required" (between the dashboard and OTEL setup slides). Closes the polyglot adoption gap — any OTLP-emitting app can use the dashboard without an AppHost. Includes mcr.microsoft.com/dotnet/aspire-dashboard:latest docker run + a Node.js OTEL config example.
Sources: aspire.dev/dashboard/standalone-for-{nodejs,python}/.

New slide: "Multi-Language Integrations" (right after AppHost Languages). Explains how the Aspire Type System (ATS) auto-generates a TypeScript SDK from .NET hosting integrations, so integration authors write the integration once in C# and TS callers get fluent typed methods with zero hand-written bindings. Marked preview.
Source: aspire.dev/extensibility/multi-language-integration-authoring/.

🟢 Polish (was queued as #41)

Both themes (light + dark): <!--fit--> titles no longer run literally edge-to-edge. Adds margin-inline: 4% (6% on cover/lead/purple/gradient/invert variants) when the H1 contains the Marp fitting SVG, and drops the bottom border on fit titles. Targets section h1:has(svg[data-marp-fitting="svg"]).

Validation

• ✅ Marp build (docker, bare template) succeeds.
• ✅ Playwright audit @ 1280×720 across all 36 slides: zero overflow.

Slides after two inserts:

#	Slide
8	Standalone Dashboard (new)
16	AppHost Languages (rewritten)
17	Multi-Language Integrations (new)
21	Agent-Ready CLI (rewritten)

Out of scope

• No demo slide edits, no new images, no theme color changes.
• The 60+ CC0 icons in the Spring '26 official deck appendix remain a future PR.

.gitignore

Adds slides/out/, slides/audit-slides.cjs, slides/package*.json so future audit/build artifacts stay out of PR diffs.