refactor: remove electrochem dispatch routers

[Pluze]

Summary:

• Removed electrochem app-owned +core/dispatch.m string routers and moved implementations into component-local package functions.
• Updated docs and project guardrails so allowed electrochem dispatch debt is zero.

Tests:

• scripts/run_matlab_tests.sh testAppsElectrochem
• scripts/run_matlab_tests.sh testProject
• scripts/run_matlab_tests.sh checkStyle
• scripts/run_matlab_tests.sh testAppsElectrochemGui
• scripts/run_matlab_tests.sh test
• git diff --check
• static scan for core.dispatch and apps/electrochem +core/dispatch.m

Unverified:

• No interactive GUI workflow was run; GUI coverage was structural/noninteractive.