fix(install): remove legacy sam references and deduplicate install.sh

[aojea]

• Remove legacy sam_${OS_NAME}_${ARCH_NAME}.tar.gz fallback and sam-* binary names from site/static/install.sh.
• Allow overriding INSTALL_DIR via AGENTMESH_INSTALL_DIR or INSTALL_DIR environment variables.
• Replace top-level install.sh with a symlink to site/static/install.sh so the script is maintained in one place while Hugo continues serving a regular file at /install.sh.

[gemini-code-assist]

Code Review

This pull request moves the installation script to site/static/install.sh, replaces the root install.sh with a symlink, removes legacy sam-* binary references, and introduces configurable installation directories. Feedback highlights that using a Git symlink for the root install.sh will break the common curl | bash installation method via GitHub raw URLs. Additionally, using the generic INSTALL_DIR environment variable poses a collision risk, and it is recommended to only support the prefixed AGENTMESH_INSTALL_DIR variable.

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install.sh (1)

Using a Git symlink for the top-level install.sh will break the common curl -fsSL https://raw.githubusercontent.com/.../install.sh | bash installation method. When fetching a symlink via GitHub's raw URL, GitHub returns the literal target path string (site/static/install.sh) rather than the contents of the target file. Consequently, running the curl command will attempt to execute the string site/static/install.sh as a command, resulting in a No such file or directory error on the user's machine.

Instead of a symlink, consider keeping install.sh at the root as the source of truth, and copy it to site/static/install.sh during the website build/deployment process, or use a pre-commit hook / Makefile target to keep them in sync.

site/static/install.sh (5)

Using the highly generic environment variable INSTALL_DIR to override the installation directory is risky. If a user has INSTALL_DIR set in their environment for another tool or build process, this script will silently install Agent Mesh into that directory instead of /usr/local/bin.

It is safer to only support the prefixed AGENTMESH_INSTALL_DIR environment variable to avoid accidental collisions.

INSTALL_DIR="${AGENTMESH_INSTALL_DIR:-/usr/local/bin}"