[BUG] ESP32-C3: ELF module execution fails with Instruction access fault

### Description / Steps to reproduce the issue

On ESP32-C3 (`esp32c3-devkit:usbconsole`), running ELF binaries from `examples/elf` ROMFS fails with an **Instruction access fault**. This is reproducible on **master**,

### Steps to reproduce
1. Clone nuttx + nuttx-apps
2. Configure:
```bash
./tools/configure.sh esp32c3-devkit:usbconsole
Enable: `CONFIG_ELF`, `CONFIG_MODULES`, `CONFIG_FS_ROMFS`, `CONFIG_BOARDCTL_ROMDISK`, `CONFIG_EXAMPLES_ELF`, `CONFIG_EXAMPLES_ELF_ROMFS`, `CONFIG_EXECFUNCS_HAVE_SYMTAB`, `CONFIG_EXECFUNCS_SYSTEM_SYMTAB`, `CONFIG_NSH_FILE_APPS`

3. Build and flash:
- make CROSSDEV=riscv32-esp-elf-
- make CROSSDEV=riscv32-esp-elf- flash ESPTOOL_PORT=/dev/ttyACM0 ESPTOOL_BINDIR=./

4. On NSH: elf
### Expected
ELF test binaries from ROMFS should run.

### Actual
riscv_exception: EXCEPTION: Instruction access fault
MCAUSE: 00000001, EPC: 3fc8b5d8, MTVAL: 3fc8b5d8
EPC is in DRAM (0x3fc8xxxx), which is not executable on ESP32-C3.

### Notes

- libs/libc/elf/elf_load.c uses `lib_memalign()` (DRAM) when `CONFIG_ARCH_USE_TEXT_HEAP` is not set.
- Current arch/risc-v/src/esp32c3/ has no `up_textheap_memalign()`.
- Legacy port has arch/risc-v/src/esp32c3-legacy/esp32c3_textheap.c (instruction-bus alias).
- Requesting guidance whether text-heap support should be ported for ELF on current ESP32-C3.

### On which OS does this issue occur?

[OS: Linux]

### What is the version of your OS?

WSL2 Ubuntu 24.04 (Linux 6.6.87.2-microsoft-standard-WSL2 x86_64)

### NuttX Version

master

### Issue Architecture

[Arch: risc-v]

### Issue Area

[Area: Board support]

### Host information

CONFIG_BASE_DEFCONFIG="esp32c3-devkit:usbconsole-dirty"
CONFIG_ARCH_CHIP="esp32c3" CONFIG_ARCH_BOARD="esp32c3-devkit"
CONFIG_ESPRESSIF_USBSERIAL=y
CONFIG_ELF=y
CONFIG_EXAMPLES_ELF=y
CONFIG_EXAMPLES_ELF_ROMFS=y
CONFIG_FS_ROMFS=y
CONFIG_BOARDCTL_ROMDISK=y

**Host**: Linux WSL2 x86_64 (6.6.87.2-microsoft-standard-WSL2)
Toolchain: riscv32-esp-elf-gcc (crosstool-NG esp-12.2.0_20230208) 12.2.0
Esptool: 5.3.0
HAL: sync/master.c-nuttx-20260428-23-g0eb59f7e02a

Board at test time: ESP32-C3 (QFN32), USB Serial/JTAG, 4MB flash

### Verification

- [x] I have verified before submitting the report.