[TheViniAlmeida]

Selecting a session in a different root must also select that root's native CLI and HOME/XDG environment. This adds explicit profiles and root-bound session references for the upcoming terminal interface, while preserving existing CLI selectors and output.

• Ephemeral profiles and optional private POSIX JSON snapshots: bounded schema, HOME/XDG-only overrides, exclusive creation and ownership/mode/symlink checks. No stored secrets, implicit writes or overwrite.
• Paginated catalog listing filters the selected root before LIMIT/OFFSET and retains missing/unsupported metadata with reasons. Authoritative reads revalidate format/root/native ID; same IDs in different roots remain distinct.
• Source and target environments are snapshotted independently through the shared operation API. Native OpenCode/Kilo store guards remain in place. Canonical MastraCode database-file roots are supported without falling through to a sibling database.
• Conservative capabilities registry exposes adapter schemas/directions/media limits. Native title overrides and in-place updates remain disabled until proven.
• Assign the two-store profile oracle to the existing exact OpenCode2.0.23 CI gate, which rejects skips. Update the implementation plan's progress pointer.

Validation: 1864 passed, 55 skipped with isolated HOME/XDG and stock OpenCode2.0.22; Ruff lint/format, shell/diff checks and wheel/sdist build passed. The built wheel passed 42 profile tests, including two native stores sharing one session ID. Independent review approved after 186 passed, 1 deselected, excluding only the opt-in real-store inventory probe. A discovered MastraCode file-root regression was fixed and independently retested. No real sessions or supplier credentials were used.

This milestone adds core APIs, not the TUI entrypoint. Profile snapshot persistence currently requires POSIX; edit/removal/overwrite are explicit future work. Historical exact-client and private-store opt-in skips are not passes. Stock2.0.23 execution is assigned to CI; local execution used stock22.