Add smart auto-submit feature

[siebertm]

Description

Say "submit" at the end of dictation to strip the word and press Enter, like auto_submit but triggered by voice rather than permanently on.

• TextProcessor::detect_submit() detects "submit" (case-insensitive, handles trailing punctuation from spoken_punctuation) at end of text
• config: text.smart_auto_submit (default false), VOXTYPE_SMART_AUTO_SUBMIT env var
• CLI: --smart-auto-submit / --no-smart-auto-submit on record start/toggle
• docs: CONFIGURATION.md, USER_MANUAL.md, SMOKE_TESTS.md

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Testing

• I have tested these changes locally
• I have run cargo test and all tests pass
• I have run cargo clippy with no warnings
• I have run cargo fmt (it shows formatting errors on unrelated code)

Documentation

• I have updated documentation as needed
• No documentation changes are needed

Additional Notes

I am no Rust developer. This was vibe-codeed using Claude Code. I have tested the functionality myself. Feel free to just close the PR or tell me what to change!

[peteonrails]

Thanks for this, @siebertm - the feature is well designed and the tests are thorough. We'd like to merge this, but it has conflicts with main now (new per-recording CLI overrides landed recently, and the file-based IPC was refactored into generic read_bool_override(name) / cleanup_bool_override(name) helpers).

Could you rebase onto main? The conflicts are in src/cli.rs, src/config.rs, and src/daemon.rs - all straightforward cases of both sides adding fields to the same structs. The main change to adapt to: your read_smart_auto_submit_override() / cleanup_smart_auto_submit_override() functions should use the new generic read_bool_override("smart_auto_submit") / cleanup_bool_override("smart_auto_submit") instead.

[siebertm]

@peteonrails this is done. squashed and signed the commit also to make the process happy :D