Rob LourensandCopilot 35edb04454 Re-parse agent host history prompts to revive slash decorations (#313158)
* Re-parse agent host history prompts to revive slash decorations

When restoring an agent host session (local `agent-host-*` or remote
`remote-*`), historical prompts were wrapped in a single ChatRequestTextPart,
losing decorations for slash commands, prompt slash commands (e.g. /skill),
and agent mentions.

Re-run the prompt through ChatRequestParser for agent host sessions so
decorated parts are revived in the UI. Falls back to a plain text part on
parse failure or empty parse result.

Also moves `isAgentHostTarget` from the browser layer into common (where
ChatService lives), with a re-export from the browser file for existing
callers.

Adds two snapshot tests for /skill parsing covering both the forcedAgent +
supportsPromptAttachments path and the no-agent fallback.

(Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Hoist empty references/tool map to avoid per-history-item allocations

Address Copilot review feedback on #313158.

(Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Source attachmentCapabilities from chat session contribution

Agent-host providers register capabilities via registerChatSessionContribution,
but that programmatic path does not create an IChatAgentData with those
capabilities. Look them up via IChatSessionsService.getCapabilitiesForSessionType
instead so /skill etc. are revived in restored history.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

(Written by Copilot)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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