feat(cloud): TOON re-encoder for JSON-array outputs

[jhonatanjunio]

Closes #3

Summary

Adds a Token-Oriented Object Notation (TOON, https://github.com/toon-format/toon) re-encoder applied to JSON-array outputs from gh, kubectl, aws, gcloud, and az. Reduces tokens on this shape by 40-60% by declaring the schema once in a header and listing rows CSV-style.

Why

gh pr list --json …, kubectl get pods -o json, aws ec2 describe-instances --output json, etc. all return arrays of uniform objects — exactly the shape TOON was designed for. Today CloudHandler only strips noise; the heavy redundant field-name repetition stays. Free 40-60%.

What changed

• New module src/strategies/toon.rs (~340 LoC incl. tests).
  • try_to_toon(text: &str) -> Option<String> — hand-rolled JSON sub-parser + TOON emitter, zero-dep.
  • Strictly lossless-or-reject: returns None for any non-uniform / nested / out-of-order / unsmaller input.
• CloudHandler calls it when the command requests JSON (--json, -o json, -ojson, --output json, --output=json, --format json, --format=json, -f json); otherwise pipes through unchanged.
• commands::cloud::tests::detects_json_request_flags verifies the detector across CLI conventions.

Worked example

Input (raw gh pr list --json number,title,state):

[
    {"number": 1, "title": "Add feature", "state": "OPEN"},
    {"number": 2, "title": "Fix bug", "state": "MERGED"},
    {"number": 3, "title": "Refactor", "state": "CLOSED"}
]

Output (TOON):

items[3]{number,title,state}:
  1,Add feature,OPEN
  2,Fix bug,MERGED
  3,Refactor,CLOSED

Constraints honoured

• Zero new runtime deps (Cargo.toml unchanged).
• Returns None if TOON would not be smaller than the input — never makes things worse.
• Falls back to the existing pipeline on any non-conforming shape.

Tests

13 new unit tests:

TOON encoder (12):

• encodes_uniform_gh_pr_list
• encodes_kubectl_pods_shape
• quotes_values_with_commas
• rejects_heterogeneous_keys
• rejects_keys_in_different_order
• rejects_nested_objects
• rejects_nested_arrays
• rejects_empty_array
• rejects_non_array_root
• rejects_when_toon_not_smaller
• handles_nulls_and_booleans_and_floats
• decodes_json_string_escapes

CloudHandler dispatch (1):

• detects_json_request_flags

Full lib suite: 172/172 passing (160 prior + 12 + 1).

Out of scope

• NDJSON streams from docker ps --format '{{json .}}' — follow-up.
• cargo metadata --format-version 1 — nested by design, not worth TOON.

[jhonatanjunio]

Superseded by upstream PR — moved to claudioemmanuel/squeez. See README of this fork for the upstream link.