[namtzigla]

What

Makes the query placeholder parser aware of string literals and comments, so a ?
inside a '...'/"..." literal or a -- / /* */ comment is no longer mistaken for a
bind placeholder.

Closes #1399.

Why

The formatter scanned for ? with a plain byte search (ReadSep('?')), so a ? in a
literal or comment consumed a positional argument and shifted every subsequent binding:

db.NewRaw(`... WHERE note='huh?' AND org_id=? AND secret=?`, 42, "s3cr3t")
// before: ... WHERE note='huh42' AND org_id='s3cr3t' AND secret=?
//   -> org_id gets the wrong value; secret=? dangles (invalid SQL)
// after:  ... WHERE note='huh?'  AND org_id=42        AND secret='s3cr3t'

Change

• Add Parser.ReadUntilPlaceholder (internal/parser): a literal/comment-aware
  replacement for ReadSep('?'). It skips '...'/"..." quoted strings (with doubled-quote
  escaping), -- line comments, and nesting /* */ block comments.
• schema/querygen.go: use ReadUntilPlaceholder() instead of ReadSep('?') (one line).

The scanner is deliberately conservative so it can never skip a genuine placeholder:
backslash escaping inside literals is not interpreted (matches
standard_conforming_strings=on, the default since PG 9.1), and $$...$$ / E'...' strings
degrade to the previous behavior rather than over-consuming. The existing \? escape and
named/positional argument handling are unchanged.

Tests

• internal/parser: unit tests for ReadUntilPlaceholder (literals, doubled quotes,
  quoted identifiers, line/nested-block comments, placeholder-before-literal).
• schema: formatter-level regression test asserting exact output; it fails on the old
  ReadSep behavior and passes with the fix. Full go test ./internal/... ./schema/... .
  passes; gofmt/go vet clean.

[github-actions]

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