fix: prevent Cordova exec startup race

[bajrangCoder]

Closes: #2848

[greptile-apps]

Greptile Summary

Replaces the startup-sensitive cordova.exec lookup with Cordova’s internal cordova/exec module and adds a regression test that imports the plugin context before the public exec mapping exists.

• Resolves the native bridge implementation through cordova.require during module initialization.
• Verifies connection establishment and plugin-token creation with cordova.exec absent.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable non-blocking issue identified.

The changed bridge lookup matches Cordova’s internal module usage pattern, and the new test directly exercises plugin-context initialization while the public cordova.exec property is unavailable.

Important Files Changed

Filename	Overview
src/lib/pluginContext.js	Uses Cordova’s internal module loader to obtain the native exec function without waiting for the public mapping.
tests/unit/pluginContext.test.js	Adds an isolated regression test covering early import, trusted-session connection, and plugin-token generation.

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