Port remaining Desktop evidence-host adapters

Traceability

• Spec ID: rust-evidence-host-remaining-adapters
• Status: Implemented
• Follows: docs/specs/2026-09-08-rust-evidence-host.md

Intent

The first evidence-host slice left seven JS session-analysis hosts as no-evidence on Desktop. Port them as the same kind of bounded snapshot the existing Rust adapters already produce, so opening a Project can surface those Sessions and the Artifact files they changed. The JS analyzers stay canonical for better-harness session-analysis.

Acceptance Scenarios

• AC-1: sessions.discover reports ok for each of augment, qwen, pi, kimi, workbuddy, dsh, and harness-run when a workspace-qualified fixture exists, and no-evidence when the home is empty. A Session has sessionId, platform, and a usable firstSeen or lastSeen.
• AC-2: Tool calls that name a file inside the Project become POSIX-relative observations. Paths outside the root are dropped.
• AC-3: Workspace matching uses each host's native identity (cwd, slug, project key, or workspace index). A foreign-cwd transcript is not attributed to the open Project.
• AC-4: PORTED lists all thirteen hosts. UNPORTED is empty. Discovery still fails closed on a single adapter error without aborting the others.
• AC-5: Native tests cover one fixture per host plus the existing slug helpers. Compressed DSH .jsonl.zstd artifacts are omitted rather than failing discovery.

Non-goals

• Replacing or changing scripts/session-analysis parsers, privacy pipelines, usage accounting, fork-cutoff dedupe, or CLI output.
• Porting DSH's fail-closed event-shape validator or Zstd frame scanner.
• Interpreting encrypted reasoning, opening tool output sidecars, or claiming field-level parity with the JS analyzers.
• New hosts, UI chrome, packaging, or CI jobs.

Plan and Tasks

Keep each adapter a discover_from(home, workspace, max) snapshot like Claude and Grok: walk the native tree, qualify by workspace, retain bounded prompts, tool names/paths, and last assistant text.

Host	Home / tree	Identity
augment	~/.augment/sessions/*.json	ide_state_node workspace folders / terminal cwd
qwen	$QWEN_RUNTIME_DIR or $QWEN_HOME or ~/.qwen/projects/<slug>/chats/*.jsonl	sanitizeCwd slug + record cwd
pi	$PI_CODING_AGENT_DIR or ~/.pi/agent/sessions/--<slug>--/*.jsonl	session header cwd; custom sessionDir is out of scope
kimi	~/.kimi-code/sessions/wd_*/ses_*/agents/*/wire.jsonl	workspaces.json / session_index.jsonl / wd_<basename>_ fallback
workbuddy	$WORKBUDDY_DIR or ~/.workbuddy/projects/<slug>/*.jsonl	slug + record cwd
dsh	$DSH_HOME or ~/.dsh/sessions/<projectKey>/<encodedId>/session.jsonl	header cwd; uncompressed only
harness-run	<workspace>/.better-harness/harness-runs/**/trace.jsonl	sibling revision.json; always this Project

Test and Review Evidence

• rustup run 1.96.0 cargo test in rust/evidence-host: 19 lib tests and 14 stdio-host tests passed, including one fixture per new host, empty-home no-evidence, slug helpers, and host.describe listing all thirteen platforms.
• Risk: snapshots are thinner than JS (no usage charts, no DSH zstd, no Pi custom sessionDir). Missing compressed DSH sessions must not be presented as an empty date window. Windows/Linux CI was not run.