Write canonical command fields and clarify base/profile labels #3021

Situation and intended change

Native phase P03 of #3018 (under E2432). After backend support lands, adapt update/saveDraft/updateCodingAgentProfiles payloads to canonical names. Clarify Base command and Additional arguments labels while keeping the composed Command preview, validation and internal consumers.

Class: design-bearing. Source owner: ac-dev-webpage-ui-v5. Depends on: P02. Sequential fresh branch from main after dependency merge/ancestry.

Files

• src/shared/types.ts
• src/shared/ipc.ts
• src/shared/ipc.transport.test.ts
• src/sidebar/components/SettingsModal.tsx
• src/sidebar/components/AgentPickerModal.tsx
• src/sidebar/components/SettingsModal.validate-agents.test.tsx
• src/sidebar/components/AgentPickerModal.test.tsx

Mandatory acceptance

1. Follow the exact approved phase, scope, ownership and green boundary; no new design decision.
2. New field with content wins; otherwise legacy fallback. Identical frozen W predicate across runtimes; validate present values and preserve selected original text.
3. Authorized updates write new fields only; retain current-source old key/value unchanged. No delete/update/synthesize old values, no write on read or new source authority.
4. Preserve fixed base arguments/wrappers, parsing, launch text, metadata, references and current identity/hash inputs. No packaged build/install/release/version bump.
5. Ship the phase proof/check receipts and exact-head applicable CI; PR closes only this child, never Clarify agent and profile command fields with new-first legacy fallback #3018. Shipper alone executes phase npm/Cargo/structural verification; developer owns source/fixtures/mutation edits and interpretation. Negative controls must fail before restored green evidence.

Canonical approved specification

Root: D:/0_repos/AgentsCommander_iac/.ac/plans/3018-command-fields/plan-v5-command-fields.md
Plan-SHA256: 6562A0C615AAB37A6A245C9FCDC0400922BE3A94C7D85B3383724A133A554305
Phase: D:/0_repos/AgentsCommander_iac/.ac/plans/3018-command-fields/p03-v4-frontend-writes.md
Phase-SHA256: A507042CA993C757DDBC6C5B76F4CAB71F12FFF8DC77A0D773B474C2B8BE5053
Five fresh approvals: room-shared/i3018-command-fields/round8-v5-consensus.md. Standing user authorization, exact mapping receipt and cold gates govern execution; plans are immutable.

Verification

Run from room-19 repo-AgentsCommander; complete inventory/positive-negative proof and executor in the phase file.

timeout 1200 npm run typecheck
timeout 1200 npm test -- src/shared/ipc.transport.test.ts src/shared/profile-utils.test.ts src/sidebar/components/SettingsModal.validate-agents.test.tsx src/sidebar/components/AgentPickerModal.test.tsx
timeout 1200 npm run check:frontend-dependencies
timeout 1200 npm run build

Layer distinction in v4: persisted Rust retains required-base/profile-default validation; frontend response projection preserves absent fields/collections/empty profile objects and no-op identity. Both present values remain strictly validated. Preserve the P01 reader and every existing consumer assertion; no default synthesis or new source authority.