Finish new format design and update ts encoder

[creationix]

No description provided.

[Copilot]

Pull request overview

Updates the RX text format encoder and documentation toward a new “paired delimiter” design (containers as []/{}/<>, schema as .), and adds new encoder tuning controls for index emission.

Changes:

• Switch container and chain encoding to paired delimiters and revise index emission to be byte-size/depth driven.
• Add schema-sharing prescan counts and emit inline schema + schema pointers for repeated object shapes.
• Extend the CLI and spec docs with the new index depth knobs and updated format description.

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 2 comments.

File	Description
rx.ts	Implements the new paired-delimiter encoder, depth-based index forcing, and schema sharing changes.
rx-cli.ts	Adds CLI flags for index depth tuning and adjusts convert --to rx to use stringify() with new options.
docs/rx-format.md	Rewrites the RX format specification to describe the new paired-delimiter model, schema, and indexes.

Comments suppressed due to low confidence (1)

rx-cli.ts:634

• rx convert --to rx now uses stringify() (new paired-delimiter encoding), but .rx inputs are still parsed via open() from rx-read.ts, which currently only understands the legacy :/; container tags. This means the CLI can generate .rx files it cannot read back (and other subcommands reading .rx will fail). Update the reader to the new format (or keep convert emitting the legacy format until the reader is updated).

function applyPath(value: unknown, segments: string[]): unknown {
	let current: unknown = value;
	const trail: string[] = [];
	for (const seg of segments) {
		if (Array.isArray(current)) {
			const idx = /^\d+$/.test(seg) ? parseInt(seg, 10) : NaN;
			if (!Number.isInteger(idx)) {
				fail("show", `path [${[...trail, seg].join(", ")}] — '${seg}' is not a numeric index (array at [${trail.join(", ")}] has length ${current.length})`);
			}
			if (idx < 0 || idx >= current.length) {
				fail("show", `path [${[...trail, seg].join(", ")}] — index ${idx} out of range in ${current.length}-element array`);
			}

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