Add Prettier formatting and Gitea Actions CI (format, typecheck, test, build)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Qxbkp4tA7G5SCWjzWuxmE

test/core/encoding.test.ts

@@ -32,7 +32,8 @@ describe('encodeIndexValue', () => {
     fc.assert(
       fc.property(indexValue, separators, (v, sep) => {
         const decoded = decodeIndexValue(encodeIndexValue(v, sep), sep)
-        if (typeof v === 'number' && v === 0) expect(decoded).toBe(0) // -0 normalised
+        if (typeof v === 'number' && v === 0)
+          expect(decoded).toBe(0) // -0 normalised
         else expect(decoded).toEqual(v)
       }),
     )

test/core/path.test.ts

@@ -1,15 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import fc from 'fast-check'
-import {
-  escapeSegment,
-  joinPath,
-  pathKeys,
-  splitPath,
-  succ,
-  toSegment,
-  unescapeSegment,
-  validateSeparator,
-} from '../../src/core/path.js'
+import { escapeSegment, joinPath, pathKeys, splitPath, succ, toSegment, unescapeSegment, validateSeparator } from '../../src/core/path.js'
 import { InvalidKeyError } from '../../src/errors.js'
 
 const separators = fc.constantFrom('/', ':', '.', '|', '#', '\\', '!')