alexion
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The SDK records a bare, upgrade-stable binary name only when a PATH entry realpath-matches the execPath it is handed. From the module-relative entrypoint that can only succeed under npm, which symlinks its bin entry straight at it; a wrapper-based install never can, because a script that invokes a file does not resolve to that file. So every wrapper install -- Nix, a shim, a generated .cmd -- recorded an absolute path that moves on upgrade, and a session-start hook that cannot execute fails silently. `setup hooks` now resolves gitea-axi on PATH itself and hands that location to the SDK, so the bare name is recorded. A candidate qualifies only if it resolves to the running entrypoint -- by realpath for a symlink, or by naming it in its text for a wrapper, following the chain, since a Nix install is two hops. A same-named binary that is some other program does not qualify, and the absolute entrypoint path stands as the fallback exactly as before. The related defect on the same line goes too: the SDK recognises its hook by finding the marker inside the recorded command, so an entrypoint path without "gitea-axi" in it made a re-run append a duplicate rather than update in place. `setup hooks` now prunes duplicates by matching the exact command it records, which is independent of that command's shape and cannot mistake another tool's hook for its own. With the coupling gone, package.nix no longer renames its build tree; the fast tier runs from /build/source and its idempotency test passes there. The help text's instruction to re-run hooks after an upgrade is deleted, having become false. Verified against the built Nix binary and a globally npm-installed pack: both record the bare name, both fall back to the absolute path when the name is absent, an impostor on PATH is refused, and re-runs leave one entry. Decision recorded as ADR 0019; ADR 0009's addendum is amended.