Support persisting custom env vars in session defaults

[kamal]

As a follow up to #203, this adds support for persisting custom environment variables into session defaults

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commit: eb2f4ff

[coderabbitai]

Walkthrough

This pull request introduces support for environment variables in session defaults. The changes extend the session defaults schema by adding an optional env field to store environment variable mappings as records of strings. The SessionDefaults type is updated to include the new env property, and the sessionDefaultKeys array is extended with the 'env' key. Test coverage is added to verify that environment defaults are stored correctly and persisted to configuration files when required. Additionally, the version is updated from '2.0.0-beta.1' to '2.0.0', marking a stable release.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding support for persisting custom environment variables in session defaults.
Description check	✅ Passed	The description is directly related to the changeset, referencing issue #203 and explaining the purpose of adding environment variable persistence to session defaults.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

src/utils/session-store.ts (1)

30-31: Shallow merge replaces the entire env object on each setDefaults call.

Because setDefaults uses object spread ({ ...this.defaults, ...partial }), calling it with a new env value will replace — not merge — the previous environment variables map. For example, setting { env: { A: '1' } } followed by { env: { B: '2' } } results in only { B: '2' }.

This is consistent with how all other keys behave, but worth confirming it matches the intended UX for environment variables, where users might expect additive/incremental updates.

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