chore(release): prepare public source release

fixtures/json-family/tonl/README.md

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+# TONL v1 fixture assumptions
+
+These fixtures define Mercury Toolbox's Rust-native TONL v1 surface for tests
+and examples.
+
+The representation is JSON-backed and line-oriented:
+
+- A document object is written as `key = <JSON value>` per non-empty line.
+- Record streams are separated by `---`.
+- Lines beginning with `#` are comments.
+- Values after `=` must be valid JSON literals, arrays, or objects.
+- Non-object root values are represented by the reserved `$ = <JSON value>` key.
+
+This keeps TONL deterministic, streamable, and easy to convert to and from JSON
+or JSONL without a Node/TypeScript runtime.

fixtures/json-family/tonl/invalid.tonl

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+# Invalid because TONL values must be JSON values.
+name = "Ada"
+score = not-json

fixtures/json-family/tonl/records.jsonl

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+{"id":"user-1","name":"Ada","active":true,"score":42}
+{"id":"user-2","name":"Bob","active":false,"score":7}

fixtures/json-family/tonl/records.tonl

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+# TONL v1 stream fixture: records separated by ---.
+---
+id = "user-1"
+name = "Ada"
+active = true
+score = 42
+---
+id = "user-2"
+name = "Bob"
+active = false
+score = 7

fixtures/json-family/tonl/sample.json

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+{"id":"user-1","name":"Ada","active":true,"score":42,"tags":["math","logic"],"meta":{"city":"London"}}

fixtures/json-family/tonl/sample.tonl

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+# TONL v1 fixture: JSON-backed key/value lines.
+id = "user-1"
+name = "Ada"
+active = true
+score = 42
+tags = ["math","logic"]
+meta = {"city":"London"}