Auto-include dump directory in symbol search path

[SSyl]

Summary

• Auto-prepend the dump file's directory to CDB's symbol search path (-y flag) so co-located PDBs are found automatically. This is on by default and matches standard debugging conventions.
• Add --no-dump-dir-symbols CLI flag to opt out of the automatic behavior.
• Add per-call symbols_path parameter to open_windbg_dump and run_windbg_cmd for explicit symbol path control. Combined with the server-level default. Only applies when creating a new session — if a session already exists, a note is returned explaining this.
• Update tool descriptions to mention that sessions are persistent and should be closed when analysis is complete. In practice, some LLMs would leave orphaned CDB processes running without this hint.

Before

PDBs sitting next to the dump file were not found — stack traces showed wrong symbols with huge offsets (export symbols only):

UE4SS!RC::get_mod_ref+0x198c9        <- WRONG, huge offset
UE4SS!RC::get_mod_ref+0x19b17        <- WRONG, huge offset

After

Same dump, correct symbols loaded automatically from the dump's directory:

UE4SS!RC::process_simple_actions::__l2::<lambda_1>::operator()+0x29   <- CORRECT
UE4SS!std::erase_if+0x44                                              <- CORRECT
UE4SS!RC::process_simple_actions+0x59                                 <- CORRECT
UE4SS!RC::engine_tick_hook+0x67                                       <- CORRECT

Test plan

• Verified open_windbg_dump loads co-located PDBs automatically (private pdb symbols)
• Verified run_windbg_cmd loads co-located PDBs on demand when stack walking triggers symbol resolution
• Verified --no-dump-dir-symbols disables the auto-include (falls back to export symbols only)
• Verified .sympath output shows dump directory prepended to symbol path
• Verified session-exists warning when symbols_path is provided on an already-active session

🤖 Generated with Claude Code