fix(string): keep a quoted identifier out of the comment scan

[tiagolauer]

Fixes #287.

The bug

// DB has a column literally named a--b
StrictRow<DB, 'select "a--b" from users'>
// QueryTypeError<'no FROM clause: cannot resolve column ""a"'>
// loose: { '"a': unknown }[]

Query<DB, `select "it's" from users`>
// the strict error text even leaked a non-literal ${string} into the message

The -- inside the quotes was taken as a line comment and ate the rest of the query; the ' opened a string-literal mask. Quoted identifiers are the documented escape hatch for special names, and these are exactly the names that need it.

The fix

StripCommentsAndMaskLiterals now recognizes the three identifier quotes and copies the body through verbatim — nothing inside a quoted name opens a comment or a literal. MaskQuotedIdentifiers already exists to protect ; from the same class of scan (#232); this extends that treatment to the pass that runs before it.

The structure of the scan changed with it, and it is the reason this is not expensive. Written as three more whole-string pattern matches per step, the fix measured 208,264 instantiations — over the 200,000 budget. Destructuring the leading character once and dispatching on it (Opener extends "'", Opener extends '-', …) makes every case a character comparison instead of a pattern match:

	instantiations
master	192,486
fix, pattern-matched	208,264 (over budget)
fix, character-dispatched	184,737

So the fix lands 7,749 below master.

Verification

tests/quoted-identifier-punctuation.test-d.ts, eleven cases. Six red on master:

tests/quoted-identifier-punctuation.test-d.ts(28,3): error TS2344: Type 'false' does not satisfy the constraint 'true'.
tests/quoted-identifier-punctuation.test-d.ts(32,3): ... (36,3), (44,3), (50,3), (54,3)

• "a--b" in both modes, "it's", "a/*b", "a$b", and one among ordinary columns
• a real trailing -- comment and a real 'x' literal in the same query as a quoted name still work

Controls: plain "id", [weird-table] and `id` are unchanged.

tsc --noEmit clean, 192 runtime tests pass.