chore(scripts): build and link every local command for unreleased testing

[jeremi]

Summary

Adds scripts/install-local.sh, a developer convenience that builds every command binary from the working tree (--locked, default release profile) and links it into ~/.local/bin (overridable via --install-dir or REGISTRY_INSTALL_DIR) as symlinks into the cargo target directory. The published product installers only install tagged release assets; this covers the gap for testing unreleased local builds. Rerunning the script after a rebuild refreshes every command at once.

Installed commands: breg bregctl casework caseworkctl discovery discoveryctl evidence evidence-oid4vci evidencectl registry-manifest relay relayctl.

Checks

• shellcheck scripts/install-local.sh is clean.
• Test run with --profile dev --install-dir <tempdir>: all twelve binaries built and ran through the links (bregctl --version, relay --version).
• Real run with the default release profile into ~/.local/bin from the current origin/main tree: all twelve commands report 0.31.0-dev.

Notes

• The cargo invocation grouping mirrors release/scripts/build-release-binaries.sh: bregctl and relayctl enable authoring-only tooling features on their server libraries, and one cargo invocation unifies features across everything it builds, so breg and relay build in separate invocations to keep the production feature set.
• mint is intentionally absent: retired in feat: add institutional contextual authorization and retire Mint #1029.
• The script replaces a non-symlink file in the install directory only with a printed notice; rerunning a product's published installer restores its release binaries. No release, migration, or compatibility impact.

DCO

• Every commit includes a Signed-off-by trailer.
• I reviewed the submitted changes and am responsible for the contribution.

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