fix(examples): export CliCommandDefinition so declaration emit can name it - #174

Summary

pnpm examples:check fails reproducibly on main: the audiobook-curator agent-bundle build dies with

error   Failed to generate declaration files. (agent-bundle-index)
[{"code":"AB5000","message":"Error occurred in agent-bundle-index declaration files generation.","severity":"error"}]

(observed in #166's report). The underlying TypeScript diagnostics, recovered by replaying the synthesized DTS program (node_modules/.agent-bundle-dts-* tsconfig) with tsc --declaration --emitDeclarationOnly, are five TS4023s:

src/operations/audible.ts(79,14): error TS4023: Exported variable 'audibleOperations' has or is using name 'CliCommandDefinition' from external module ".../src/cli-command" but cannot be named.

#150 introduced src/cli-command.ts with CliCommandDefinition unexported while the exported operations factories (audibleOperations, discoveryOperations, evidenceOperations, mediaMutationOperations, outputOperations) return objects of defineCliCommand(...) results, so their inferred declaration types must name it from other modules. This is emit-only: tsc --noEmit (the example's typecheck) passes, which is why only the declaration build failed. Fix: export the interface.

Not the dev lock: AB5000 is the CLI's catch-all diagnostic code, and the initial report attributed it to dev-lock contention ("another development process owns this project"). The check pipeline (validate/build/typecheck/test/test:routes) never acquires the dev lock — its only production acquirer is the DevCoordinator behind agent-bundle dev — and dead-pid reclaim is already covered by tests/dev-lock.test.ts ("recovers a dead lock only after probing its recorded pid", the eight-contender recovery-gate test). A leaked dev.lock with a dead owner pid (998818, from this morning's OOM-killed dev session) existed in the primary checkout's example tree and was deleted surgically, but it could not have caused this failure and reproduction succeeds in a pristine worktree.

Regression gate

An emit-only TS4023 is invisible to --noEmit typecheck and to runtime tests by construction; the executable gate is declaration emit itself, which pnpm --filter ./examples/audiobook-curator check (and the examples-check CI job) runs via agent-bundle build. That exact reproduction now passes — package build emits all 39 files including the .d.ts graph.

Test plan

• Reproduced on pristine main worktree: audiobook build fails with AB5000/TS4023 (serial and 3-way-concurrent)
• After fix: DTS program replay clean (tsc --declaration --emitDeclarationOnly, exit 0)
• pnpm --filter ./examples/audiobook-curator check green (validate, build, typecheck, 35+2 tests)
• Full pnpm examples:check green
• Root pnpm typecheck and scoped rslint clean