test: add provider compatibility evals

[RNT56]

Summary

• add hermetic golden transcripts for generic OpenAI-compatible, reasoning, structured-output, and OpenRouter request/response contracts
• exercise Anthropic native web-search rendering and prove hostile raw server-tool results are dropped before loop re-entry
• prove the client fallback flags suspicious content, fences it as untrusted data, and escapes embedded fence markers
• fail if either token-cap key duplication or fixture-secret leakage reaches the transcripts

Verification

• go build ./...
  go vet ./...

WARNING: golangci-lint not installed — skipping local lint (CI still enforces it).
Install the pinned version for local/CI parity (see .github/workflows/ci.yml).
go test ./...
ok nilcore/cmd/nilcore (cached)
ok nilcore/cmd/tools/nilcore-browser (cached)
ok nilcore/cmd/tools/nilcore-desktop (cached)
ok nilcore/cmd/tools/nilcore-desktop-darwin (cached)
ok nilcore/eval (cached)
ok nilcore/eval/browse (cached)
ok nilcore/eval/desktop (cached)
ok nilcore/eval/provider-compat 0.733s
ok nilcore/eval/self (cached)
ok nilcore/internal/advisor (cached)
ok nilcore/internal/agent (cached)
ok nilcore/internal/agent/bus (cached)
ok nilcore/internal/agenticflows (cached)
ok nilcore/internal/artifact (cached)
ok nilcore/internal/artifact/evverify (cached)
ok nilcore/internal/artifact/packs (cached)
ok nilcore/internal/artifact/packs/audit (cached)
ok nilcore/internal/artifact/packs/benchmark (cached)
ok nilcore/internal/artifact/packs/code (cached)
ok nilcore/internal/artifact/packs/finance (cached)
ok nilcore/internal/artifact/packs/software (cached)
ok nilcore/internal/artifact/packs/ui (cached)
ok nilcore/internal/artifact/packs/web (cached)
ok nilcore/internal/artifact/schema (cached)
ok nilcore/internal/ask (cached)
ok nilcore/internal/autosrc (cached)
ok nilcore/internal/backend (cached)
ok nilcore/internal/blastbudget (cached)
ok nilcore/internal/browseragent (cached)
? nilcore/internal/browseragent/plan [no test files]
ok nilcore/internal/browsersession (cached)
ok nilcore/internal/browserwire (cached)
ok nilcore/internal/budget (cached)
ok nilcore/internal/capability (cached)
ok nilcore/internal/capguard (cached)
ok nilcore/internal/cdp (cached)
ok nilcore/internal/channel (cached)
ok nilcore/internal/channel/slack (cached)
ok nilcore/internal/channel/telegram (cached)
ok nilcore/internal/codeintel/ast (cached)
ok nilcore/internal/codeintel/graph (cached)
ok nilcore/internal/codeintel/impact (cached)
ok nilcore/internal/codeintel/live (cached)
ok nilcore/internal/codeintel/lsp (cached)
ok nilcore/internal/codeintel/repomap (cached)
ok nilcore/internal/codeintel/retrieve (cached)
ok nilcore/internal/codeintel/semantic (cached)
ok nilcore/internal/cron (cached)
ok nilcore/internal/desktop (cached)
ok nilcore/internal/desktopagent (cached)
ok nilcore/internal/desktopsession (cached)
ok nilcore/internal/desktopwire (cached)
ok nilcore/internal/egressprofile (cached)
ok nilcore/internal/embed (cached)
ok nilcore/internal/emit (cached)
ok nilcore/internal/eventlog (cached)
ok nilcore/internal/experience (cached)
ok nilcore/internal/flywheel/distiller (cached)
ok nilcore/internal/flywheel/loop (cached)
ok nilcore/internal/flywheel/measure (cached)
ok nilcore/internal/flywheel/selfeval (cached)
ok nilcore/internal/forge (cached)
ok nilcore/internal/graapprove (cached)
ok nilcore/internal/guard (cached)
ok nilcore/internal/inbox (cached)
ok nilcore/internal/inspect (cached)
ok nilcore/internal/integrate (cached)
ok nilcore/internal/kernel (cached)
ok nilcore/internal/loopctl (cached)
ok nilcore/internal/maint (cached)
ok nilcore/internal/mcp (cached)
ok nilcore/internal/memory (cached)
ok nilcore/internal/memory/lessons (cached)
ok nilcore/internal/meter (cached)
ok nilcore/internal/model (cached)
ok nilcore/internal/objective (cached)
ok nilcore/internal/onboard (cached)
ok nilcore/internal/paths (cached)
ok nilcore/internal/planner (cached)
ok nilcore/internal/policy (cached)
ok nilcore/internal/pool (cached)
ok nilcore/internal/project (cached)
ok nilcore/internal/provider (cached)
ok nilcore/internal/registry (cached)
ok nilcore/internal/report (cached)
ok nilcore/internal/report/render (cached)
ok nilcore/internal/requeue (cached)
ok nilcore/internal/roster (cached)
ok nilcore/internal/route (cached)
ok nilcore/internal/router (cached)
ok nilcore/internal/sandbox (cached)
ok nilcore/internal/scheduler (cached)
ok nilcore/internal/scmhook (cached)
ok nilcore/internal/secrets (cached)
ok nilcore/internal/selfimprove (cached)
ok nilcore/internal/server (cached)
ok nilcore/internal/session (cached)
ok nilcore/internal/skills (cached)
ok nilcore/internal/som (cached)
ok nilcore/internal/spawn (cached)
ok nilcore/internal/steering (cached)
ok nilcore/internal/store (cached)
ok nilcore/internal/strongcap (cached)
ok nilcore/internal/summarize (cached)
ok nilcore/internal/super (cached)
ok nilcore/internal/swarm (cached)
ok nilcore/internal/swarm/board (cached)
ok nilcore/internal/swarm/preset (cached)
ok nilcore/internal/termui (cached)
ok nilcore/internal/tools (cached)
ok nilcore/internal/trace (cached)
ok nilcore/internal/trigger (cached)
ok nilcore/internal/trust (cached)
ok nilcore/internal/verb (cached)
ok nilcore/internal/verify (cached)
ok nilcore/internal/verify/selfacc (cached)
ok nilcore/internal/verify/vcache (cached)
ok nilcore/internal/wake (cached)
ok nilcore/internal/worktree (cached)
ok nilcore/internal/worktreefs (cached)
ok nilcore/test/smoke (cached)

• go test -race
  ./internal/session/...
  ./internal/swarm/...
  ./internal/agent/...
  ./internal/super/...
  ./internal/scheduler/...
  ./internal/pool/...
  ./internal/channel/...
  ./internal/blastbudget/...
  ./internal/model/...
  ./internal/meter/...
  ./internal/mcp/...
  ./internal/trace/...
  ./internal/trust/...
  ./internal/graapprove/...
  ok nilcore/internal/session (cached)
  ok nilcore/internal/swarm (cached)
  ok nilcore/internal/swarm/board (cached)
  ok nilcore/internal/swarm/preset (cached)
  ok nilcore/internal/agent (cached)
  ok nilcore/internal/agent/bus (cached)
  ok nilcore/internal/super (cached)
  ok nilcore/internal/scheduler (cached)
  ok nilcore/internal/pool (cached)
  ok nilcore/internal/channel (cached)
  ok nilcore/internal/channel/slack (cached)
  ok nilcore/internal/channel/telegram (cached)
  ok nilcore/internal/blastbudget (cached)
  ok nilcore/internal/model (cached)
  ok nilcore/internal/meter (cached)
  ok nilcore/internal/mcp (cached)
  ok nilcore/internal/trace (cached)
  ok nilcore/internal/trust (cached)
  ok nilcore/internal/graapprove (cached)
• go build -tags tui ./...
  && go vet -tags tui ./cmd/nilcore ./internal/swarm/board ./internal/trace
  && go test -tags tui ./cmd/nilcore ./internal/swarm/board ./internal/trace
  ok nilcore/cmd/nilcore (cached)
  ok nilcore/internal/swarm/board (cached)
  ok nilcore/internal/trace (cached)
• 0 issues.
• No vulnerabilities found.
• ok nilcore/eval/provider-compat 1.698s

Closes P15-T13.