refactor: graduate dead_code tests to tests/, delete obsolete artifacts

[codejedi-ai]

Migrated (dead_code/ → tests/ with cleanup):

• test_duckduckgo_search.py → tests/test_web_search.py
• test_fda_run.py → tests/test_fda_navigation_simple.py
• test_fda_detailed.py → tests/test_fda_navigation_detailed.py
• test_fda_headed.py → tests/test_fda_navigation_headed.py
• test_fda_simple_headed.py → tests/test_fda_navigation_simple_headed.py

Cleanup applied to all migrated tests:

• Removed stale sys.path.insert (tests/ is inside the package now)
• Consistent TARGET_URL constant at module level
• Consistent if name == "main" guard

Deleted (already live or obsolete):

• dead_code/core/ (memory entities/ops already in smolclaw/agent/)
• dead_code/tools/ (smolagents-style registry superseded by EIM)
• dead_code/fix_event_sourcing.py (one-time repair script, already applied)

dead_code/ directory fully removed.

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Note

Low Risk
Low risk because changes are limited to deleting unused legacy modules and minor refactors to test scripts, with no production logic modified.

Overview
Deletes the legacy dead_code/ tree (old core memory helpers, tool registry/browser tools, and a one-off fix_event_sourcing.py script).

Cleans up and standardizes the migrated smoke tests in tests/ (FDA navigation variants and DuckDuckGo search): removes sys.path hacks, introduces a shared TARGET_URL constant, and normalizes the __main__ entrypoints and output/result dumping.

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