feat(project): update project metadata

[tarik02]

Problem

t3cli uses project.meta.update only for action scripts. It cannot update the rest of the project metadata supported by T3 Code.

Scope

Add project update --project <ref> for all five editable metadata fields:

• Title
• Workspace root
• Default model selection
• Default thread environment mode
• Favicon override

Reuse the existing model-selection input conventions where possible.

Nullable fields need explicit clear flags:

• --clear-default-model
• --clear-thread-env
• --clear-favicon

Reject a value flag combined with its matching clear flag, and require at least one change.

Path behavior

• Treat workspace roots as paths on the target environment.
• For a locally authenticated environment, allow relative roots and resolve them from the CLI working directory.
• For a remote environment, require an absolute workspace root.
• Treat a favicon override as a workspace-relative supported image path.

Acceptance criteria

• Omitted fields remain unchanged.
• Clear flags send null, not omission.
• The command prints the updated project in the selected output format.
• Server validation errors, including duplicate workspace roots, remain structured CLI errors.

[tarik02]

@codex implement

[chatgpt-codex-connector]

To use Codex here, create an environment for this repo.

[tarik02]

@codex implement

[chatgpt-codex-connector]

Summary

• Added project update with support for title, workspace root, default model selection, default thread environment, and favicon metadata. Nullable fields support explicit clear flags, conflicting flags are rejected, and at least one change is required.
• Added local/remote workspace-root handling, workspace-relative favicon validation, model-selection resolution, metadata dispatch, and updated-project snapshot retrieval.
• Generalized project.meta.update command construction so omitted metadata remains omitted while explicit null values are preserved.
• Extended the project application API and registered the new command in the project command group.
• Added human-readable updated-project output, command documentation, and a minor release changeset.
• Committed the implementation as 03a38c4 (feat(project): add metadata update command).

Testing

• ✅ git diff --check
• ✅ git status --short --branch
• ⚠️ git submodule update --init --recursive (the environment’s network proxy returned HTTP 403 while cloning the upstream T3 Code submodule)
• ⚠️ pnpm install --offline --ignore-scripts (installation could not proceed because the unavailable upstream submodule supplies a required dependency patch)
• ⚠️ /opt/codex/mcp/.venv/bin/python /tmp/call_make_pr.py (the provided make_pr MCP server could not start because its environment lacks the expected mcp.server.fastmcp module)

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