fix: update stale localnet config template

[Copilot]

closes #2635

The localnet config template docs/localnet/mpc-config.template.toml had two stale values that caused incorrect behavior when setting up a localnet environment.

Changes

• [near_init]: Added download_genesis = false — without this, the node attempts to download a genesis file instead of using the local one specified by genesis_path
• [tee]: Added sha256: prefix to image_hash — the hash value was missing the required digest algorithm prefix

[near_init]
chain_id = "mpc-localnet"
download_genesis = false        # added
boot_nodes = "$NEAR_BOOT_NODES"
genesis_path = "$HOME/.near/mpc-localnet/genesis.json"

[tee]
image_hash = "sha256:8b40f81f77b8c22d6c777a6e14d307a1d11cb55ab83541fbb8575d02d86a74b0"  # prefix added

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[claude]

Reviewed the config template changes. Both fixes are straightforward corrections to the localnet setup template:

• download_genesis = false prevents the node from ignoring the local genesis_path
• sha256: prefix on image_hash matches the expected digest format

No issues found.

✅

[claude]

PR title type suggestion: This PR updates a documentation/template file, so the type prefix should probably be docs: instead of fix:.
Suggested title: docs: update stale localnet config template

[claude]

PR title type suggestion: This PR updates a config template file, which is documentation. The type prefix should be docs: instead of fix:.

Suggested title: docs: update stale localnet config template