Echoserver Channel Regrouping

[ejohnstown]

Refactor of the echoserver example only; library is unchanged.

1. Collapse FwdStates and AGENT_STATE_* into a single WS_AppState (INIT/LISTEN/CONNECT/CONNECTED). FWD_STATE_DIRECT becomes an isDirect flag, cleared after connect.
2. Hoist the fields shared by the forwarding, agent, and shell paths into a common WS_AppCtx (privateData, listenFd, appFd, channelId, state, buffer). Shell only uses buffer.
3. Feature-specific remainder stays in WS_AgentCbActionCtx (name) and WS_FwdCbActionCtx (host/origin name+port, isDirect). Drop the unused pid field; inline getpid() at the call site.
4. wolfSSH_AGENT_DefaultActions and wolfSSH_FwdDefaultActions now take a WS_AppCtx* and reach feature-specific state via appCtx->privateData. echoserver_test() is updated to register the WS_AppCtx (not the old CbCtx) with wolfSSH_set_agent_cb_ctx and wolfSSH_SetFwdCbCtx.
5. Reindent ssh_worker()'s #ifdef blocks and add /* WOLFSSH_xxx */ markers.
6. fwd.test.expect: redirect echoserver and portfwd output to log files and sync on portfwd's -R ready file instead of matching "sampled" in the pty. Under --enable-debug the WLOG volume fills the pty and stalls portfwd in select() before channel-open.

[Copilot]

Pull request overview

This PR refactors the echoserver example’s channel/forwarding/agent state handling by consolidating per-feature state into a shared WS_AppCtx (with a unified WS_AppState), and updates the forwarding expect test to avoid deadlocks caused by verbose debug logging filling the PTY buffer.

Changes:

• Consolidate forwarding and agent state machines into WS_AppState, and hoist shared fields into WS_AppCtx with per-feature “private” state hung off privateData.
• Update agent/fwd default action callbacks to accept a WS_AppCtx* and fetch feature-specific state via appCtx->privateData.
• Make scripts/fwd.test.expect more robust under --enable-debug by redirecting output to files and syncing on portfwd’s -R ready file.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
scripts/fwd.test.expect	Redirects server/client output to log files and waits on a ready file instead of PTY output matching to prevent debug-log PTY stalls.
examples/echoserver/echoserver.c	Refactors example forwarding/agent/shell state into WS_AppCtx/WS_AppState and updates callbacks + worker loop to use the regrouped state.

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[padelsbach]

A couple minor suggestions, but looks good overall