[schickling-assistant]

Problem

Fabric pairing discovers only ST_FABRIC_ADAPTER and st-fabric-adapter, so it cannot consume installations using the new Fractal names.

Change

• Share adapter discovery between fleet join and invitation creation.
• Accept FRACTAL_FABRIC_ADAPTER and ST_FABRIC_ADAPTER; refuse different paths when both are set.
• Search beside the executable, then each PATH directory; prefer fractal-fabric-adapter over st-fabric-adapter within each directory.
• Preserve explicit join overrides, configured-missing-path behavior, and existing absence diagnostics. The produced binary remains st-fabric-adapter.
• Add precedence/conflict/absence coverage and a release note. No new dependency or policy abstraction.

Verification

• gate-slot --lane build -- nix develop -c cargo test -p smallclaims --lib fabric_adapter_ — 2 passed, covering environment overrides, conflict refusal, both names at every search location, and absence.
• gate-slot --lane build -- nix develop -c cargo test -p fractal --test integration an_invitation_only_fabric_could_carry_fails_before_it_exists — 1 passed; existing absence error remains unchanged.
• scripts/rust-test-inputs-scan --check .st/rust-test-inputs.json — exit 0.
• Exact tested head: 4713322916799f75f61a72cb0210218fdccbfec7. Isolated Cargo artifacts removed afterward (2,324,637,184 allocated bytes).
• Initial CLI test invocation used the unregistered fleet target; corrected to the registered integration target above. Existing unrelated TUI warnings were emitted.

STE: before, only legacy helper names were discoverable; after, tests prove both names, deterministic precedence and fail-closed conflicting overrides. Shared resolver removes duplicated discovery; no new dependency.

Open questions

None. This is accepting-reader slice B2; executable/environment producers are intentionally unchanged.

Posted on behalf of @schickling

field	value
agent_identity	agent/dotfiles/fabric-mesh
session	01a1ecd5
agent_persona	generalist
agent_supervisor	unavailable
agent_tool	OMP
agent_tool_version	18.12.5
agent_runtime	OMP 18.12.5
agent_model	anthropic/claude-opus-5-5
worktree	smalltalk/rename-fabric-b2

[schickling-assistant]

Merge record (Fabric-mesh, fractal merge rule Q26+Q31):

• Exact head: 4713322.
• Independent GO at this exact head: reviewer Review4439 (no findings).
• Required checks at this head (Workspace CI run 41170922397): linux-gate, genie-freshness, typescript-client and fractal-web all passed.
• State: MERGEABLE, CLEAN, not a draft.
• Scope: rename slice B2, helper discovery accepting readers only. The producer binary name and the deployed ST_FABRIC_ADAPTER behaviour do not change. Siblings A1 Accept both Fabric fleet protocol names at reader boundaries #4424 (d3c5284) and A3 Accept both native Fabric client URI service names #4429 (cf0e2e8) are merged.
  Fabric-mesh now enqueues this PR into the merge queue.

Posted on behalf of @schickling

field	value
agent_identity	agent/dotfiles/fabric-mesh
session	01a1ecd5
agent_persona	generalist
agent_supervisor	unavailable
agent_tool	OMP
agent_tool_version	18.12.5
agent_runtime	OMP 18.12.5
agent_model	anthropic/claude-opus-5-5
worktree	smalltalk/main