fix(deparser): keep empty bit strings, collision-free dollar tags and case-sensitive option strings valid

[pyramation]

Summary

The TS deparser produces SQL that either fails to parse or means something different for three edge cases (constructive-io/constructive-planning#2175). This PR fixes all three.

Real bugs (what's broken today → what changes)

1. Empty hex bit string: SELECT X'' deparses as SELECT b'x', which PG rejects ("x" is not a valid binary digit). The hex regex ^x[0-9A-Fa-f]+$ now uses *, so the output is x''.

2. Dollar-quote collisions: getFunctionDelimiter tried $$ and then $EOFCODE$, and used $EOFCODE$ even when the body contained both. It also missed bodies that end with a prefix of the tag, such as ...--$ followed by $$. A tag now counts as a conflict when the tag appears in body + tag before body.length (dollarTagConflicts). If both tags conflict, the deparser tries $EOFCODE1$, $EOFCODE2$, … in order and takes the first that is free, so output is deterministic.

3. Option strings losing meaning: formatOptionValue printed any identifier-shaped String bare. WITH (opt = 'Foo') became Foo, which folds to foo, and 'int'/'select' became a type or a keyword. A value now prints bare only when it is lowercase [a-z_][a-z0-9_]* and keywordKindOf(v) === 'NO_KEYWORD'. Anything else goes through QuoteUtils.escape.

   Side effect: string values that are keywords ('true', 'simple') now print quoted (security_barrier = 'true'). PG reads both forms as the same String arg, so behaviour is unchanged.

Tests: new fixture __fixtures__/kitchen-sink/misc/literal-edge-cases.sql. npm run kitchen-sink produced generated.json and misc-literal-edge-cases.test.ts. That test fails on main and passes with this change. Full deparser suite: 312 suites / 748 tests pass.

constructive-db ports the same three fixes to its SQL deparser and syncs this fixture into its suite: constructive-io/constructive-db (feat/deparser-edge-literals).

Link to Devin session: https://app.devin.ai/sessions/a49105664e454ee19eb145330f00f61c
Open in Devin Desktop: https://app.devin.ai/desktop/session/a49105664e454ee19eb145330f00f61c?variant=devin
Requested by: @pyramation

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring

[tenki-reviewer]

Review complete. No issues found — approved ✅.

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This PR hardens the SQL deparser against literal edge cases by adding a new kitchen-sink fixture (literal-edge-cases.sql), its generated AST fixture, and a corresponding kitchen-sink test, plus targeted fixes in deparser.ts for literal and quoting behavior.

Files	Change
packages/deparser/src/deparser.ts	Fixes literal edge-case handling: empty hex/bit-string literals, dollar-tag conflict detection, and option-value quoting
__fixtures__/kitchen-sink/misc/literal-edge-cases.sql	New SQL fixture covering 21 literal edge cases
__fixtures__/generated/generated.json	Regenerated AST fixture snapshot for the new literals fixture
packages/deparser/__tests__/kitchen-sink/misc-literal-edge-cases.test.ts	New kitchen-sink test round-tripping the new fixtures

The scanner wave produced no findings meeting the confidence threshold, so the review verdict is approve.

_{Reviewed commit: e5373c5}