ci: bind workflow inputs via env before shell

[SashaMIT]

Summary

• Bind inputs.severity through env: before socket-fix shell.
• Bind inputs.registry_address through env: before rollup upgrade deploy shell.
• Bind inputs.networks through env: before network healthcheck shell.
• Bind IRM l1_network / namespace / network / monitoring_namespace through env: before validate/deploy shell.
• Same class as GitHub’s documented script-injection guidance for interpolating workflow inputs into run: scripts.

Test plan

• socket-fix still runs with configured severity (default high)
• rollup upgrade deploy still receives registry address
• healthcheck still expands the networks list
• IRM validate/deploy still resolves namespace defaults

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