fix(env): unquote reverses backslash escape

[oratis]

Closes #3.

What

quoteValue and unquote in src/env.ts were asymmetric. saveConfigEnv escapes \ → \\ when serializing, but loadConfigEnv → unquote only reverses \" → " and \n → newline — it never undoes the \\. Every save/load cycle therefore doubled the number of backslashes in any value containing one.

Before vs after (round-trip)

Input	Quoted (file)	Before — unquote returned	After
C:\Users\path	"C:\\Users\\path"	C:\\Users\\path ✗	C:\Users\path ✓
API\KEY_X	"API\\KEY_X"	API\\KEY_X ✗	API\KEY_X ✓
with\backslash	"with\\backslash"	with\\backslash ✗	with\backslash ✓

ASCII-safe values (no special chars), values with ", and values with \n were unaffected — still round-trip identically.

Change

return first === '"'
  ? inner.replace(/\\(["\\n])/g, (_, c) => (c === "n" ? "\n" : c))
  : inner;

Single-pass replace with a substitution callback. The alternative — three sequential .replace() calls — has an ordering trap: doing /\\\\/g → \\ first would consume the leading \\ in \\n and produce a stray \n token; doing \n first would produce a real newline before the \\ step could see the surrounding context. The callback form covers all three escape sequences in one left-to-right pass.

Verification

10-case round-trip test (passthrough, spaces, quotes, newlines, single/double/trailing backslashes, Windows paths, combination): all pass. Output in the issue body.

Scope

• One file (src/env.ts), one function (unquote, 3-line change)
• No public API change, no new deps
• npm run typecheck clean

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