Add dual output mode (human/plain) with TTY auto-detection

[hev]

Summary

• Adds global --output/-o flag to choose between human (rich tables) and plain (pipe-delimited) output
• Auto-detects TTY when flag is omitted: interactive terminal gets rich output, piped/redirected gets plain
• Removes 80-char content truncation from list and search commands (fixes copy-paste of IDs and data)
• Plain mode suppresses all decorative output (counts, emojis, performance info, colors) — data only

Files changed

File	Change
src/tpuff/utils/output.py	New — resolve_output_mode, is_plain, print_table_plain, status_print
src/tpuff/cli.py	Add -o/--output option, store resolved mode in context
src/tpuff/commands/list.py	Plain mode branch for namespace and document listing; remove truncation
src/tpuff/commands/search.py	Plain mode branch for FTS and vector search; remove truncation
src/tpuff/commands/get.py	Plain mode outputs raw JSON only
src/tpuff/commands/schema.py	Plain mode for schema get (implicit --raw) and display_batch_summary

Plain output format

Namespace|Rows|Logical Bytes|Index Status|Unindexed Bytes|Updated
my-ns-1|1,234|45.67 MB|up-to-date|0 B|3:42 pm
my-ns-2|5,678|123.45 GB|updating|2.30 GB|Jan 15, 2026

Test plan

• tpuff list in terminal — Rich table as before (no truncation)
• tpuff list | cat — auto-detects non-TTY, outputs pipe-delimited
• tpuff -o plain list — force plain mode in terminal
• tpuff -o human list | cat — force human mode even when piped
• tpuff -o plain search "query" -n ns --fts field — pipe-delimited search results
• tpuff -o plain get ID -n ns — raw JSON only
• tpuff -o plain schema get -n ns — raw JSON (same as --raw)

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