build(installer): add authoritative binary target

[sandersonstabo]

Outcome

Adds the authoritative Bazel installer executable and unit-test target, integrates the Rust installer into the Cargo/Crate-Universe workspace, and registers it in root build, lint, format, and test aggregates.

The installed executable identity remains the clean installer.exe; Cargo's internal package name remains ae-installer.

Verification

• //modules/installer:installer and installer_unit_test build
• installer unit tests and four-binary Cargo identity proof pass
• fresh direct Clippy markers for installer, installer tests, and identity proof
• root //:format_test passes
• cargo metadata --locked --offline --format-version 1 passes
• exact-head hash guards and Bazel shutdown 0

Receipt: D:/artisan-editor-gate-logs/portable-installer-bazel-target-20260829-gate3/receipt.json

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Summary by cubic

Adds the authoritative Bazel installer binary and unit-test target for the Rust installer module, and registers it in the root build, lint, format, and test aggregates. The installed executable stays installer.exe and the Cargo package stays ae-installer.

• Integrates modules/installer into the Cargo workspace and regenerates Cargo.lock/Cargo.Bazel.lock.
• Fixes installer error messages to display non-Unicode payload paths correctly.

^{Written for commit aea8fef. Summary will update on new commits.}