Separate listener, payload, and agent identities

[Darkroom4364]

Closes #64

Summary

• generate fresh payload/build IDs instead of reusing the selected listener ID
• add listener/payload metadata to generated agent config while leaving runtime agent_id empty by default
• add runtime agent ID resolution in the Rust agent with optional explicit override and persisted generated fallback
• include payload/listener metadata in heartbeat while routing by runtime agent ID
• validate listener heartbeat path/body ID consistency and reject malformed operator agent paths
• add regression tests for distinct payload builds, multi-agent isolation on one listener, heartbeat ID mismatch, and agent runtime ID behavior

Verification

• go test ./...
• go vet ./...
• go build -o /private/tmp/microc2-server-issue64 ./cmd
• bash -n install.sh
• bash -n agent/build.sh
• node --check server/web/js/*.js
• cargo fmt --check
• cargo test --locked
• cargo clippy --locked --all-targets (passes with existing warnings)
• cargo build --locked (passes with existing warnings)
• Foxguard: npx foxguard@latest diff --format json origin/dev . -> 0 new issues

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