feat(setup/project-init): initialize TypeScript ESM project skeleton

- package.json with @alkdev/taskgraph, ESM primary, CJS compat exports
- tsconfig.json targeting Node 18+, strict mode, declaration output
- All production deps: graphology suite, @alkdev/typebox, yaml
- Dev deps: typescript, vitest, @types/node
- src/ skeleton: schema, graph, analysis, frontmatter, error modules
- test/ directory with 5 placeholder test files
- .gitignore and vitest.config.ts

src/analysis/bottleneck.ts

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+// bottlenecks (graphology betweenness)

src/analysis/cost-benefit.ts

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+// calculateTaskEv, workflowCost, computeEffectiveP

src/analysis/critical-path.ts

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+// criticalPath, weightedCriticalPath

src/analysis/decompose.ts

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+// shouldDecomposeTask

src/analysis/defaults.ts

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+// resolveDefaults, enum numeric methods

src/analysis/index.ts

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+// Analysis submodule — re-exports
+
+export * from './critical-path.js';
+export * from './bottleneck.js';
+export * from './risk.js';
+export * from './cost-benefit.js';
+export * from './decompose.js';
+export * from './defaults.js';

src/analysis/risk.ts

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+// riskPath, riskDistribution