Agents and messages name Zerops Mate, not T3 Code

[fxck]

Removes the old product name from what agents are told and what people read, as decided after intake row 5.

What changes

• Agents:
  • Claude, Codex, Cursor and Antigravity are told they run in Zerops Mate.
  • Codex's context key is now mate_runtime, so the model no longer sees a <t3_code_runtime> tag.
  • The title prompts ask for a title for "this thread".
  • OpenCode's text sessions and Codex's client title say Zerops Mate.
• Messages:
  • Provider statuses say "disabled in settings".
  • Compatibility, update, install, sign-in and OpenCode version messages name Zerops Mate.
  • Also changed: the CLI descriptions, the provider settings hint, the t3.json schema descriptions (the t3.codes pointer is gone), the relay API title and the relay client error.
• Checkpoint commits are authored by Mate <mate@zerops.io>, the identity the snapshot path already uses.

What stays

Identifiers that name the client to a vendor stay unchanged:

• the Codex originator t3code_desktop;
• the Grok OAuth referrer t3code;
• the ACP client names.

Also unchanged:

• inherited plumbing names (t3, T3CODE_*, @t3tools/*);
• code comments;
• the desktop app's own name and data directory.

Guard

scripts/product-name.test.ts parses every string, template and JSX text literal in apps/server/src, packages/contracts, packages/shared and packages/client-runtime with oxc-parser, and fails on "T3 Code". Upstream ports would otherwise bring the name back with every intake.

• It failed against main with the old strings listed, and passes here.
• oxc-parser is pinned at the 0.148.0 the lockfile already carried, because TypeScript 7 has no JS parser API.

fork.md §4.1 states the rule, and intake row 5 records the decision.

Verification

• Every test file next to a changed source passes: 22 server files (752 tests), plus contracts, shared and the new guard.
• Typecheck passes for server, contracts, shared and scripts.
• vp check passes on the touched files.

🤖 Generated with Claude Code