Fix libscrapli FFI logger level mismatch and resolve PR review comments

[Copilot]

The test / unit CI job was failing after bumping libscrapli to v0.0.1-rc.25.2, and PR #16 had 10 unresolved review comments flagging deadlock risks, panics, silently-ignored options, and broken backward compatibility.

Root cause: FFI logger level wire mismatch

libscrapli v0.0.1-rc.25.2 changed how the FFI options' logger_level byte is decoded (parseLoggerLevel in src/ffi-options.zig), remapping it to warn=0, trace=1, debug=2, info=3, critical=4, fatal=5. scrapligo was reusing scrapligologging.IntFromLevel — which encodes the internal severity ordering (trace=0...fatal=5) used for message filtering — to build this wire byte, so Warn (3) was sent and decoded as info:

// before: reused the internal severity-ordering function for the wire value
opts.loggerLevel = uint8(scrapligologging.IntFromLevel(o.LoggerLevel))

// after: dedicated mapping matching libscrapli's parseLoggerLevel
opts.loggerLevel = ffiLoggerLevelFromLevel(o.LoggerLevel)

ffiLoggerLevelFromLevel (internal/options.go) now owns this translation independently, leaving IntFromLevel/LevelFromInt untouched for their existing internal-filtering role.

Review comment fixes

• cli/result.go: added Input() / InputAtIndex() accessors (previously Inputs became private with no way to read it back); rejected negative indexes in ResultAtIndex/ResultRawAtIndex instead of panicking.
• internal/logging.go, internal/netconf.go, internal/recorder.go: dispatcher callbacks now release the read lock before invoking user code, avoiding a deadlock if the callback re-enters and needs the write lock; nil message pointers are now guarded instead of dereferenced.
• options/cli.go: restored WithDefintionContent as a deprecated wrapper around the renamed WithDefinitionContent to preserve compatibility for existing callers.
• cli/cli.go: ReplaceDefinition now sets the new definition path before calling loadDefinition, so the new definition is actually loaded instead of the stale one.
• netconf/get_config.go: getFilterType/getDefaultsType now perform the same pointer conversion used elsewhere, so WithFilterType/WithDefaultsType reach libscrapli instead of being silently dropped.
• util/file.go: LoadFileLines now returns scannerErr on scan failure instead of the unrelated (nil) err.

[Copilot]

🟡 Changes recommended

Input() incorrectly collapses multiple empty inputs instead of preserving their newline-separated representation.

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Pull request overview

Fixes FFI compatibility and addresses reliability/API regressions from PR #16.

Changes:

• Corrects logger-level and NETCONF option encoding.
• Hardens callbacks and result indexing.
• Restores compatibility and fixes definition/file handling.

File summaries

File	Description
util/file.go	Returns scanner errors correctly.
options/cli.go	Restores deprecated option alias.
netconf/get_config.go	Forwards filter/default option values.
internal/recorder.go	Prevents callback deadlocks and nil dereferences.
internal/options.go	Adds correct FFI logger-level mapping.
internal/netconf.go	Safely dispatches capability callbacks.
internal/logging.go	Safely dispatches logging callbacks.
cli/result.go	Adds input accessors and index validation.
cli/cli.go	Loads replacement definitions correctly.

Review details

• Files reviewed: 9/9 changed files
• Comments generated: 1
• Review effort level: Balanced

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