chore(compat): declare dsh.compat metadata

[Shizuku-keop]

Declares machine-readable compatibility metadata (dsh.compat) so tooling can
gate upgrades before they break:

• 
  equires: >=0.1.0-rc.7
• \ ested: 0.1.0-rc.7 0.1.0-rc.8 0.1.1-rc.1 0.1.1-rc.2 (verified 2026-08-25 by dsh-compat-guard local matrix:
  install + full tree mount + clean exit on all four DSH versions)
• \storageFormats: zstd-jsonl

Generated by dsh-compat-guard (https://github.com/Shizuku-keop/dsh-compat-guard).
Note: the tested list covers the plugin's API surface across DSH rc.7 -> rc.2;
the per-version results live in the compatibility registry (Blue-Whale-Harness/compat).

[Shizuku-keop]

Hi maintainers — quick note from the author of dsh-compat-guard. This PR only adds machine-readable dsh.compat metadata (requires / tested / storageFormats) to package.json; no runtime behavior changes. The tested list was verified on 2026-08-25 via isolated install + full tree-mount smoke across DSH 0.1.0-rc.7, 0.1.0-rc.8, 0.1.1-rc.1 and 0.1.1-rc.2 (8/8 pass); per-version results also live in the community compat registry (Shizuku-keop/Blue-Whale-Harness/compat). Happy to adjust the range, kind value, or split the change — just say the word. Thanks for maintaining this!