feat(js): add TCP/TLS integration tests and examples

[atharvalade]

Which issue does this PR close?

Closes #2808

Rationale

No TLS integration tests or TLS examples existed for the Node.js SDK despite full TLS transport support.

What changed?

The Node.js SDK had TLS transport implemented via createTlsSocket() but no tests exercising it and no examples showing usage.

Added TLS e2e tests in foreign/node/src/e2e/tls.system.e2e.ts covering ping, login, stats, send/poll messages over TLS, and plain TCP failure when TLS is required. Added tcp-tls/producer.ts and tcp-tls/consumer.ts examples using transport: 'TLS' with custom CA certificate from core/certs/.

Local Execution

Passed. eslint clean on both examples/node and foreign/node.

AI Usage

1. Opus 4.6
2. guided by existing getting-started examples and tcp.system.e2e.ts test patterns
3. Compiled and linted locally, verified code follows existing patterns exactly
4. Yes

[atharvalade]

Resolved

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 102 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.37%. Comparing base (514b5c5) to head (f850eef).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
foreign/node/src/e2e/tls.system.e2e.ts	33.33%	102 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2822      +/-   ##
============================================
- Coverage     71.44%   71.37%   -0.08%     
  Complexity      708      708              
============================================
  Files           969      970       +1     
  Lines         78219    78372     +153     
  Branches      60029    60029              
============================================
+ Hits          55884    55935      +51     
- Misses        20002    20104     +102     
  Partials       2333     2333              

Flag	Coverage Δ
node	91.35% <33.33%> (-1.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
foreign/node/src/e2e/tls.system.e2e.ts	33.33% <33.33%> (ø)

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