dcdpr / jp / 27721933543

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feat(cli): Add stdin target `-`, regex and `--list` to `c grep` (#755)

Introduce three related improvements to conversation management:

**Stdin target (`-`)** — any multi-ID command now accepts `-` as a
target to read conversation IDs from standard input, one per line.
`ConversationTarget::Stdin` maps `-` at parse time; resolution reads
stdin once, trims blank lines, and parses each line as a
`ConversationId` with the same validation applied to command-line IDs.
The target is rejected on single-value commands and cannot be combined
with other targets. Terminal stdin (nothing piped) errors immediately
rather than blocking.

**`c grep --regex`/`-r`** — treats the pattern as a `fancy-regex`
expression instead of a plain substring, enabling look-around,
backreferences, and anchors (`\A`, `\z`). A new `Matcher` enum in
`shared/search.rs` encapsulates both modes so the matching predicate is
compiled once and reused across all lines of all conversations.

**`c grep --list`/`-l`** — prints only the unique conversation IDs that
contain at least one match, one per line (JSON array under `-F json`).
This is the producer half of the stdin pipeline:

```sh
jp c grep -l --regex '\Apr-triage:\d{3}\z' | jp c archive -
```

**Archive confirmation** — bulk archive (`jp c archive id1 id2 …` or `jp
c archive -`) now prompts for each conversation when more than one is
targeted, showing the conversation title alongside its ID so the
selection can be verified before committing. Prompt output for both
`archive` and `rm` was also corrected to use `prompt_writer()` instead
of `out_writer()`, keeping prompt text off the data channel.

RFD 086 documents the stdin-input convention and its relationship to the
four-channel output model (RFD 048).

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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