docs(adr): AGMSG_HOME data-root override, env-var naming convention#284
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Records the design decided for the desktop app's standalone mode: an optional AGMSG_HOME env var that, when set, points every install (CLI and the app's bundled fallback) at the same db/teams/run root, avoiding the schema-mismatch class of failure behind the 2026-06-30 storage fleet incident. Unset behavior is unchanged for existing CLI installs; the app defaults its own unset case to ~/.agmsg/ and prefers a detected system install over its bundled fallback when present. Also documents a naming convention for future env vars (_HOME/_DIR/_DIRS/ _FILE, avoid the ambiguous _PATH suffix AGMSG_STORAGE_PATH already carries) so new additions don't repeat that ambiguity. Design only — implementation is a separate, larger changeset threading the override through storage.sh/join.sh/actas-lock.sh/resolve-project.sh/ config.sh and friends, tracked separately.
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Summary
Records the design decided for the desktop app's standalone mode (
worktrees/desktop-app):AGMSG_HOME: an optional env var that, when set, points every install (CLI and the desktop app's bundled fallback) at the samedb//teams//run/root. When unset, each consumer keeps its current default — CLI installs are unaffected; the app defaults its own unset case to~/.agmsg/and prefers a detected system install over its bundled fallback when present. This avoids the schema-mismatch class of failure behind the 2026-06-30 storage fleet incident (globalinstall.sh --updateof a schema-axis build while a heterogeneous watcher fleet was running)._HOME(root)/_DIR(single dir)/_DIRS(list)/_FILE(single file); avoid the ambiguous_PATHsuffixAGMSG_STORAGE_PATHalready carries (grandfathered, not renamed — that would be breaking).Clarifies this does not reopen ADR 0002's
AGMSG_HOMErejection — that was scoped to external type-plugin discovery, a different concern from this ADR's data-root override.Scope
Design only. Implementation (threading the override through
storage.sh/join.sh/actas-lock.sh/resolve-project.sh/config.shand friends) is a separate, larger changeset — will be tracked as its own issue once this ADR is reviewed.