Build: pin nightly-2026-02-18; fix json target spec + function pointer casts#2
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Implements a zero-manual-steps GDB debug workflow. No address copying,
no probe-then-restart, works reliably regardless of UEFI load address.
## Rust: debug mailbox (bootloader/src/main.rs, shared/src/constants.rs)
efi_main now writes its own runtime address to a fixed physical page at
boot entry, before any other UEFI calls:
physical 0x7000 + 0x00 u64 runtime efi_main address
physical 0x7000 + 0x08 u64 magic sentinel 0xDEADBEEF_CAFEF00D
The page is reserved via UEFI AllocateType::Address so the firmware
records our ownership in the memory map. The address and sentinel
constants live in shared/src/constants.rs::debug_mailbox.
## GDB: theseus-auto command (debug.gdb)
New 'theseus-auto' GDB command that:
1. Sets a hardware watchpoint on the magic sentinel at 0x7008
2. Issues 'continue' — UEFI boots, efi_main writes address then magic
3. Watchpoint fires: reads runtime efi_main from 0x7000
4. Calls theseus-load with the captured address (correct section deltas)
5. Returns to GDB prompt — execution is stopped inside efi_main with
full Rust source-level symbols
No reset required. The watchpoint catches efi_main on its first
execution. The user is dropped exactly at efi_main+81 with symbols.
## Python: gdb-auto.py updated (scripts/gdb-auto.py)
Simplified to a single-run workflow:
- Start QEMU running (not paused) with TCP GDB stub on :1251
- Connect GDB, run theseus-auto, wait for watchpoint + symbol load
- Drop into interactive GDB or report result (--no-interactive)
## Verified
Tested across multiple runs — efi_main loads at different addresses
each time (0x7d0e4873, 0x7d0d7873, 0x7d0d9873 etc.) and the watchpoint
correctly captures the address every run:
Thread 1 hit Hardware watchpoint 1: *(u64*)0x7008 == 0xdeadbeefcafef00d
theseus-auto: mailbox fired — runtime efi_main = 0x7d0e4873
rip = 0x7d0e48c4 <theseus_efi::efi_main+81>
#2 theseus_efi::efi_main at bootloader/src/main.rs:124
## Usage
make debug-auto # interactive session
make debug-auto-ci # CI smoke-test, exits after verify
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