feat(cli): Improve help text, error handling, and add fuzzy command suggestions

CLI help improvements (cli/mod.rs):
- Add descriptive help text to all global flags (-c, --robot, -J, etc.)
- Add descriptions to all subcommands (Issues, Mrs, Sync, etc.)
- Add --no-quiet flag for explicit quiet override
- Shell completions now shows installation instructions for each shell
- Optional subcommand: running bare 'lore' shows help in terminal mode,
  robot-docs in robot mode

Structured clap error handling (main.rs):
- Early robot mode detection before parsing (env + args)
- JSON error output for parse failures in robot mode
- Semantic error codes: UNKNOWN_COMMAND, UNKNOWN_FLAG, MISSING_REQUIRED,
  INVALID_VALUE, ARGUMENT_CONFLICT, etc.
- Fuzzy command suggestion using Jaro-Winkler similarity (>0.7 threshold)
- Help/version requests handled normally (exit 0, not error)

Robot-docs enhancements (main.rs):
- Document deprecated command aliases (list issues -> issues, etc.)
- Document clap error codes for programmatic error handling
- Include completions command in manifest
- Update flag documentation to show short forms (-n, -s, -p, etc.)

Dependencies:
- Add strsim 0.11 for Jaro-Winkler fuzzy matching

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cli/commands/mod.rs

@@ -17,10 +17,13 @@ pub use count::{
     print_count, print_count_json, print_event_count, print_event_count_json, run_count,
     run_count_events,
 };
-pub use doctor::{print_doctor_results, run_doctor};
+pub use doctor::{DoctorChecks, print_doctor_results, run_doctor};
 pub use embed::{print_embed, print_embed_json, run_embed};
 pub use generate_docs::{print_generate_docs, print_generate_docs_json, run_generate_docs};
-pub use ingest::{IngestDisplay, print_ingest_summary, print_ingest_summary_json, run_ingest};
+pub use ingest::{
+    DryRunPreview, IngestDisplay, print_dry_run_preview, print_dry_run_preview_json,
+    print_ingest_summary, print_ingest_summary_json, run_ingest, run_ingest_dry_run,
+};
 pub use init::{InitInputs, InitOptions, InitResult, run_init};
 pub use list::{
     ListFilters, MrListFilters, open_issue_in_browser, open_mr_in_browser, print_list_issues,