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feat(cli, config, conversation): Implement conversation compaction (#544)

Add `jp conversation compact` command and `--compact` / `-k` flag across
`query`, `fork`, and `compact` commands, implementing RFD 064
(non-destructive conversation compaction).

The core idea is that compaction is additive: a `Compaction` overlay
event is appended to the conversation stream rather than modifying or
deleting any existing events. The projection layer applies overlays at
request-build time (`Thread::into_parts()`), so the LLM sees a reduced
view while the full raw history is preserved on disk.

**What users can do now:**

```sh
# Compact with workspace defaults (strip reasoning + tools)
jp conversation compact

# Strip reasoning, keep last 5 turns
jp conversation compact --reasoning --keep-last 5

# Preview without applying
jp conversation compact --dry-run

# Remove all compaction events (undo)
jp conversation compact --reset

# Compact before querying (inline DSL, summarize all but last 3 turns)
jp query -k s:..-3 -- "Continue the task"

# Fork and compact in one step
jp conversation fork --compact
```

**DSL (`--compact=SPEC`)** supports `r` (reasoning), `t` (tools), `s`
(summarize) as policy letters, combined with `+`, and an optional range
after `:`. Examples: `s:..-3`, `r+t`, `s:5..-3`. Bare `--compact`
applies config rules; `--compact=SPEC` applies inline rules; both forms
compose.

**Summarization** calls the configured LLM and stores the result in the
`Compaction` event as a `SummaryPolicy`. At projection time the covered
turns are replaced with a synthetic request/response pair containing the
summary text. Summary range auto-extension prevents partial overlaps
with existing summary compactions.

**Configuration** is under `conversation.compaction.rules` — a
`MergedVec<CompactionRuleConfig>` where each rule produces one
compaction event. The built-in default (strip reasoning + tools) uses
`discard_when_merged: true` so it is replaced the moment any user ... (continued)

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