[risu729]

Replaces #1584 and keeps its commit, plus review fixes.

Summary

• packages/bitwarden/src/local-crypto.test.ts keeps the synthetic account and SDK helpers, the shared sessions array, the root afterEach and the three describe scopes. Synchronous registrar modules in packages/bitwarden/test/local-crypto/ hold the account initialization, cipher isolation and item repair cases.
• The local-crypto.test.ts max-lines exemption is removed from .oxlintrc.json (the largest file is 704 lines).

Review fixes on top of #1584

• cipher-isolation.ts imports bitwardenTotpSecret from __fixtures__/totp directly, like its other fixtures, instead of receiving it through the context. The entry drops that import and field.
• Added test/local-crypto/context.ts with AccountInitializationContext, CipherIsolationContext and ItemRepairContext, replacing the hand-written Pick lists in each module.
• The docs section now sits after the sibling test organization sections and describes the layout rather than the change. It names LocalCryptoTestFixtures and context.ts, says the modules are not discovered as test files, and drops the dependency-order rationale, since __fixtures__/totp only exports constants.
• Merged main; the docs conflict is resolved by keeping every main section and adding this one before "Login wire contracts".

Verification

• Vitest JSON reporter test IDs for src/local-crypto.test.ts: 126, identical to main and all passing.
• Inlining the registrars back gives the main file, apart from the moved imports and the exported type.
• oxfmt --check, oxlint packages/bitwarden, rumdl check docs/development.md, mise run //packages/bitwarden:typecheck pass.

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