fix(installer): use clean lifecycle binary name

[sandersonstabo]

Outcome

Converges every versioned installer lifecycle check on the approved clean executable leaf: versions/<version>/bin/installer.exe on Windows and installer elsewhere.

The stable launcher remains ae.exe; the internal Cargo package remains ae-installer.

Verification

• real //modules/installer:installer and unit-test targets build
• installer unit suite and four-binary identity proof pass
• fresh direct Clippy markers pass
• root //:format_test passes
• locked/offline Cargo metadata passes
• exact-head hash guards and Bazel shutdown 0

Receipt: D:/artisan-editor-gate-logs/portable-installer-lifecycle-name-20260829-gate1/receipt.json

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Summary by cubic

Renames the versioned installer lifecycle binary from ae-installer to installer (installer.exe on Windows), so every lifecycle check uses the same clean name.

• Adds a shared versioned_installer_path helper for the platform-specific path used in install, repair, and tests.
• Release archives must now contain bin/installer (bin/installer.exe on Windows); the MissingInstaller error text is updated to match.

^{Written for commit 1139de8. Summary will update on new commits.}