feat: integrate framework files into monorepo under packages/mosaic/framework/

Moves all Mosaic framework runtime files from the separate bootstrap repo
into the monorepo as canonical source. The @mosaic/mosaic npm package now
ships the complete framework — bin scripts, runtime configs, tools, and
templates — enabling standalone installation via npm install.

Structure:
  packages/mosaic/framework/
  ├── bin/          28 CLI scripts (mosaic, mosaic-doctor, mosaic-sync-skills, etc.)
  ├── runtime/      Runtime adapters (claude, codex, opencode, pi, mcp)
  ├── tools/        Shell tooling (git, prdy, orchestrator, quality, etc.)
  ├── templates/    Agent and repo templates
  ├── defaults/     Default identity files (AGENTS.md, STANDARDS.md, SOUL.md, etc.)
  ├── install.sh    Legacy bash installer
  └── remote-install.sh  One-liner remote installer

Key files with Pi support and recent fixes:
- bin/mosaic: launch_pi() with skills-local loop
- bin/mosaic-doctor: --fix auto-wiring for all 4 harnesses
- bin/mosaic-sync-skills: Pi as 4th link target, symlink-aware find
- bin/mosaic-link-runtime-assets: Pi settings.json patching
- bin/mosaic-migrate-local-skills: Pi skill roots, symlink find
- runtime/pi/RUNTIME.md + mosaic-extension.ts

Package ships 251 framework files in the npm tarball (278KB compressed).

packages/mosaic/framework/tools/git/pr-list.ps1

@@ -0,0 +1,76 @@
+# pr-list.ps1 - List pull requests on Gitea or GitHub
+# Usage: .\pr-list.ps1 [-State state] [-Label label] [-Author author]
+
+[CmdletBinding()]
+param(
+    [Alias("s")]
+    [ValidateSet("open", "closed", "merged", "all")]
+    [string]$State = "open",
+
+    [Alias("l")]
+    [string]$Label,
+
+    [Alias("a")]
+    [string]$Author,
+
+    [Alias("n")]
+    [int]$Limit = 100,
+
+    [Alias("h")]
+    [switch]$Help
+)
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+. "$ScriptDir\detect-platform.ps1"
+
+function Show-Usage {
+    @"
+Usage: pr-list.ps1 [OPTIONS]
+
+List pull requests from the current repository (Gitea or GitHub).
+
+Options:
+    -State, -s STATE        Filter by state: open, closed, merged, all (default: open)
+    -Label, -l LABEL        Filter by label
+    -Author, -a USER        Filter by author
+    -Limit, -n N            Maximum PRs to show (default: 100)
+    -Help, -h               Show this help message
+
+Examples:
+    .\pr-list.ps1                              # List open PRs
+    .\pr-list.ps1 -s all                       # All PRs
+    .\pr-list.ps1 -s merged -a username        # Merged PRs by user
+"@
+    exit 1
+}
+
+if ($Help) {
+    Show-Usage
+}
+
+$platform = Get-GitPlatform
+
+switch ($platform) {
+    "github" {
+        $cmd = @("gh", "pr", "list", "--state", $State, "--limit", $Limit)
+        if ($Label) { $cmd += @("--label", $Label) }
+        if ($Author) { $cmd += @("--author", $Author) }
+        & $cmd[0] $cmd[1..($cmd.Length-1)]
+    }
+    "gitea" {
+        $cmd = @("tea", "pr", "list", "--state", $State, "--limit", $Limit)
+
+        if ($Label) {
+            Write-Warning "Label filtering may require manual review for Gitea"
+        }
+        if ($Author) {
+            Write-Warning "Author filtering may require manual review for Gitea"
+        }
+
+        & $cmd[0] $cmd[1..($cmd.Length-1)]
+    }
+    default {
+        Write-Error "Could not detect git platform"
+        exit 1
+    }
+}