feat(persona-kit): drop traits + sandbox (Track D)

[khaliqgant]

Summary

Implements Track D from the schema-cascade spec (docs/plans/deploy-v1-schema-cascade-spec.md, §496–557). The previous cascade run mistakenly marked Track-D as MERGE_READY=1 because its original target branch (refactor/persona-kit-schema-lockin) had no commits ahead of main and workforce#95 covered a different concept (tiers flatten, not traits/sandbox). This PR is the missing Track-D work.

• Remove the persona-level traits field + PersonaTraits type + parseTraits / re-exports.
• Remove the persona-level sandbox field + PersonaSandbox / PersonaSandboxConfig types + parseSandbox / re-exports. The codex-level harnessSettings.sandboxMode, workspaceWriteNetworkAccess, and dangerouslyBypassApprovalsAndSandbox are untouched — those are the harness sandbox flag, separate from this concept.
• Parser now rejects either key with the spec-mandated v1 migration error pointing at docs/plans/deploy-v1.md.
• Add JSDoc on PersonaSpec / PersonaSchedule / PersonaIntegrationConfig framing them as the clock + radio listener parts of a persona's listener surface (inbox reserved for later).
• Strip sandbox: true from examples/weekly-digest/persona.json.
• Rewrite docs/plans/deploy-v1.md §3 narrative — drop traits/sandbox rows from the additions table, repurpose §3.4 into "Sandbox (deploy-time, not persona-level)", and §3.6 into "Traits (removed in v1)".
• Update the deploy sandbox launcher to stop reading per-persona sandbox.timeoutSeconds (the sandbox-client default ~600s applies; harness-level timeouts continue to live on harnessSettings.timeoutSeconds).

Acceptance bullets (spec §547)

• traits and sandbox types removed from persona-kit types.ts and parse.ts.
• Parser rejects traits and sandbox with the spec-specified errors (covered by two new tests in parse.test.ts).
• All persona fixtures + 15 core personas (including proactive-agent-builder) parse without errors — personas-core lint is green.
• Listeners JSDoc + deploy-v1.md §3 narrative updated.
• Persona JSON schema regen: emit-schema.mjs does not exist on this branch — flagged for workforce#94 to pick up on rebase, per spec step 4.
• corepack pnpm -r run build && corepack pnpm run typecheck && corepack pnpm -r run test all green (376 tests pass across 7 packages).
• PR opens as DRAFT.

Test plan

• corepack pnpm -r run build — green.
• corepack pnpm run typecheck (incl. typecheck:examples) — green.
• corepack pnpm -r run test — 376/376 tests pass.
• corepack pnpm -r --filter @agentworkforce/personas-core run lint — 15 personas validate.
• New parse.test.ts cases assert the exact spec error wording for traits and sandbox rejection.

Downstream

Unblocks the workforce sweep that was stalled on Track-D=SKIPPED:

• Track E sub-tracks (feat(runtime): adopt Relayfile-VFS as the canonical integration-client style #92/feat(persona-kit): JSON Schema export + fixture personas + lint codes #94/feat(runtime): proactive-runtime interop bridge to @agent-assistant #96/feat(persona-kit): add IntegrationConfig.source discriminator (deployer_user | workspace | workspace_service_account) #97 = E1/E3/E4/E5) — rebase onto post-Track-D main.
• Track F (feat(runtime): resolve persona inputs from agents.input_values + expose ctx.agent/ctx.deployment #100) — workforce runtime input-values.
• Track H (feat(deploy): --mode cloud (OSS-generic persona+bundle POST) #102) — workforce --mode cloud.
• Track I (feat(deploy): support deploy input overrides #101) — workforce --input flags.
• Track K (test(deploy): e2e smoke for weekly-digest --mode cloud #99).

Each will need a rebase against this branch's main commit once it merges; expect mechanical conflicts in packages/persona-kit/src/parse.ts / types.ts for branches that touched the same blocks.

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