[Bug]: A malformed naming pattern escapes loads as a raw ValueError or IndexError

[fedonman]

Bug Description

A naming: pattern in a .qp schema: block is applied lazily, so a malformed one fails when the first bus path resolves through it. _resolve_bus_path narrows its except to (AttributeError, KeyError), which catches only the unknown-placeholder case. A malformed format string, a positional placeholder, or a format spec the substituted text cannot satisfy all raise out of loads unwrapped, with no line number.

Minimal Reproducible Example

import qprogram as qp

for pattern in ("{", "{0}", "{index:d}"):
    body = f'#!QProgram 1.0\n\nschema:\n  naming: "{pattern}"\n  element q:\n    drive info=IQ\n\nbody:\n  play q[0].drive "p"\n'
    qp.loads(body)

Expected Behavior

A ParseError on the naming: line, or on the bus-path line, the way an unknown placeholder already reports: Line 7: bus path 'q[0].drive' does not resolve against the program schema: 'foo'.

Actual Behavior

ValueError: Single '{' encountered in format string
IndexError: Replacement index 0 out of range for positional args tuple
ValueError: Unknown format code 'd' for object of type 'str'

.qp Text

#!QProgram 1.0

schema:
  naming: "{0}"
  element q:
    drive info=IQ

body:
  play q[0].drive "p"

System Information

qprogram 0.1.0
python   3.14.7 | Linux-6.18.33.2-microsoft-standard-WSL2-x86_64-with-glibc2.43
vendors  none