ESM: add named exports, changelog, and docs updates

Add CHANGELOG.md and update README docs and image links; tidy .gitignore. Convert modules to ESM-style exports by adding named exports (export { foo }) and replace direct Math destructuring with imports from util.js where appropriate. Small behavioral/safety fixes: validate even N in kaiserBesselDerived, minor ultraspherical iteration fix/optimization, and various window modules adjusted for consistent exports. Update package.json repository/homepage to audiojs. Overall prepares/cleans the package for the ESM v3 release and improves consistency across modules.

Author: dy

.gitignore

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-
-# Directories #
-###############
-reports/
-build/
-
-# Compiled source #
-###################
-*.com
-*.class
-*.dll
-*.exe
-*.o
-*.so
-
-# Packages #
-############
-# it's better to unpack these files and commit the raw source
-# git has its own built in compression methods
-*.7z
-*.dmg
-*.gz
-*.iso
-*.jar
-*.rar
-*.tar
-*.zip
-
-# Logs and databases #
-######################
-*.log
-*.sql
-*.sqlite
-
-# OS generated files #
-######################
+node_modules/
 .DS_Store
-.DS_Store?
-._*
-.Spotlight-V100
-.Trashes
-Icon?
-ehthumbs.db
-Thumbs.db
-Desktop.ini
-
-# Temporary files #
-###################
-*~
-
-# Node.js #
-###########
-/node_modules/
-
-# Matlab #
-##########
-
-# Windows default autosave extension
-*.asv
-
-# Compiled MEX binaries (all platforms)
-*.mex*
-/.claude
+*.log
+.claude/

CHANGELOG.md

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+# Changelog
+
+## 3.0.0
+
+Breaking: ESM-only. `require()` no longer works.
+
+- **34 window functions** (was 18): added connes, powerOfSine, generalizedNormal, planckTaper, exponential, hannPoisson, cauchy, rifeVincent, confinedGaussian, kaiserBesselDerived, dolphChebyshev, taylor, dpss, ultraspherical, parzen, bohman
+- **Quantitative metrics**: `enbw`, `scallopLoss`, `cola`
+- **Individual files**: `import hann from 'window-function/hann'`
+- **Default + named exports**: both `import hann from` and `import { hann } from` work
+- **TypeScript declarations** included
+- **Scientific SVG plots** for all windows (time domain + frequency response)
+- Consolidated to ESM (`"type": "module"`)
+- Single `util.js` for shared helpers and utilities
+- Zero dependencies (fourier-transform is devDependency for plot generation only)
+
+### Migration
+
+```diff
+- const hann = require('window-function/hann')
++ import hann from 'window-function/hann'
+```
+
+The per-sample API `fn(i, N, ...params) → number` is unchanged.
+
+## 2.1.0
+
+- Added `apply` and `generate` helpers
+
+## 2.0.2
+
+- 18 window functions: rectangular, triangular, bartlett, welch, hann, hamming, cosine, blackman, exactBlackman, nuttall, blackmanNuttall, blackmanHarris, flatTop, bartlettHann, lanczos, gaussian, tukey