Fix: recoverable diagnostics for truncated TLV value

[SoorajDe]

Fix:
sigflow/parsers/tlv.py now treats truncated TLV values (header parsed, but declared value length exceeds remaining bytes) as recoverable diagnostics instead of raising a hard ParseError.

Behavior:

• emits context.warn("tlv-truncated", ...)
• stops parsing gracefully via break

Tests:

• added regression coverage in tests/test_parsers.py

• verifies truncated TLV input:

  • does not raise ParseError
  • emits tlv-truncated diagnostic

Validation:

• pytest -q
• all tests passing (12 total)

[jmestwa-coder]

This PR is related to issue #4 and also connected to PR #12.

[jmestwa-coder]

@SoorajDe

LGTM, Merging.

[jmestwa-coder]

@SoorajDe, Thank you for your contribution.

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