What type of PR is this?

• feat (new feature)
• fix (bug fix)
• docs (documentation)
• style (formatting, no code change)
• refactor (code change that neither fixes a bug nor adds a feature)
• perf (performance improvement)
• test (adding or updating tests)
• chore (maintenance, tooling)
• build / ci (build or CI changes)

Which issue(s) this PR fixes

Fixes #

What this PR does / why we need it

memoria init -i prefill support

• --tool, --api-url, --token can now be passed alongside -i to skip corresponding interactive steps
• When --api-url + --token are provided, DB and Embedding steps are skipped entirely
• Summary always shows directory, tool, and connection info
• API mode runs connectivity check against /health endpoint

Codex support (4th AI tool)

• MCP written to ~/.codex/config.toml (global, TOML format)
• Rules written to {project}/AGENTS.md (single merged file)
• Append-only: preserves existing user content, only replaces the memoria section
• detect_tools, cmd_status, cmd_rules all updated for Codex

memoria update subcommand

• Fetches latest release tag from GitHub API
• Compares with current version, skips if already up to date
• Downloads with progress display (MB / MB %)
• Auto-fallback to ghproxy on failure
• Uses self_replace for in-place binary replacement
• Permission denied → suggests sudo memoria update

install.sh improvements

• --tool, --api-url, --token args: auto-runs memoria init after install
• Auto-detects existing installation, skips download if version matches
• Auto-fallback to ghproxy (ghfast.top) when GitHub download fails within 10s
• MEMORIA_GHPROXY env var to override proxy URL
• Auto-confirms when all init params provided (no need for -y)