agent: move "sketch-base" into git

The agent's notion of "initial commit" is kind of special, in that it
is used as the "base" for a bunch of git operations. It's hard for
the user to change (we only provide a workflow via restart), yet
sometimes you want to do just that.

So, instead we put it as data inside of it, named as a tag sketch-base.
It's abusing tags, but branches are no better.
diff --git a/loop/testdata/agent_loop.httprr b/loop/testdata/agent_loop.httprr
index c5c9474..80114d1 100644
--- a/loop/testdata/agent_loop.httprr
+++ b/loop/testdata/agent_loop.httprr
@@ -1,9 +1,9 @@
 httprr trace v1
-16931 2233
+16935 2032
 POST https://api.anthropic.com/v1/messages HTTP/1.1

 Host: api.anthropic.com

 User-Agent: Go-http-client/1.1

-Content-Length: 16733

+Content-Length: 16737

 Anthropic-Version: 2023-06-01

 Content-Type: application/json

 

@@ -535,7 +535,7 @@
  ],
  "system": [
   {
-   "text": "You are the expert coding assistant and architect powering Sketch,\nan agentic coding environment that helps users accomplish coding tasks through autonomous analysis and implementation.\n\n\u003cworkflow\u003e\nStart by asking concise clarifying questions as needed.\nOnce the intent is clear, work autonomously.\nAim for a small diff size while thoroughly completing the requested task.\n\nCall the title tool as soon as the topic of conversation is clear, often immediately.\n\nBreak down the overall goal into a series of smaller steps.\n(The first step is often: \"Make a plan.\")\nThen execute each step using tools.\nUpdate the plan if you have encountered problems or learned new information.\n\nWhen in doubt about a step, follow this broad workflow:\n\n- Think about how the current step fits into the overall plan.\n- Do research. Good tool choices: bash, think, keyword_search\n- Make edits.\n- Repeat.\n\nTo make edits reliably and efficiently, first think about the intent of the edit,\nand what set of patches will achieve that intent.\nThen use the patch tool to make those edits. Combine all edits to any given file into a single patch tool call.\n\nThe done tool provides a checklist of items you MUST verify and\nreview before declaring that you are done. Before executing\nthe done tool, run all the tools the done tool checklist asks\nfor, including creating a git commit. Do not forget to run tests.\n\u003c/workflow\u003e\n\n\u003csystem_info\u003e\n\u003cplatform\u003e\nlinux/amd64\n\u003c/platform\u003e\n\u003cpwd\u003e\n/\n\u003c/pwd\u003e\n\u003c/system_info\u003e\n\n\u003cgit_info\u003e\n\u003cgit_root\u003e\n\n\u003c/git_root\u003e\n\u003cHEAD\u003e\n\n\u003c/HEAD\u003e\n\u003c/git_info\u003e\n\n",
+   "text": "You are the expert coding assistant and architect powering Sketch,\nan agentic coding environment that helps users accomplish coding tasks through autonomous analysis and implementation.\n\n\u003cworkflow\u003e\nStart by asking concise clarifying questions as needed.\nOnce the intent is clear, work autonomously.\nAim for a small diff size while thoroughly completing the requested task.\n\nCall the title tool as soon as the topic of conversation is clear, often immediately.\n\nBreak down the overall goal into a series of smaller steps.\n(The first step is often: \"Make a plan.\")\nThen execute each step using tools.\nUpdate the plan if you have encountered problems or learned new information.\n\nWhen in doubt about a step, follow this broad workflow:\n\n- Think about how the current step fits into the overall plan.\n- Do research. Good tool choices: bash, think, keyword_search\n- Make edits.\n- Repeat.\n\nTo make edits reliably and efficiently, first think about the intent of the edit,\nand what set of patches will achieve that intent.\nThen use the patch tool to make those edits. Combine all edits to any given file into a single patch tool call.\n\nThe done tool provides a checklist of items you MUST verify and\nreview before declaring that you are done. Before executing\nthe done tool, run all the tools the done tool checklist asks\nfor, including creating a git commit. Do not forget to run tests.\n\u003c/workflow\u003e\n\n\u003csystem_info\u003e\n\u003cplatform\u003e\nlinux/amd64\n\u003c/platform\u003e\n\u003cpwd\u003e\n/\n\u003c/pwd\u003e\n\u003c/system_info\u003e\n\n\u003cgit_info\u003e\n\u003cgit_root\u003e\n\n\u003c/git_root\u003e\n\u003cHEAD\u003e\nHEAD\n\u003c/HEAD\u003e\n\u003c/git_info\u003e\n\n",
    "type": "text",
    "cache_control": {
     "type": "ephemeral"
@@ -546,24 +546,24 @@
 Anthropic-Organization-Id: 3c473a21-7208-450a-a9f8-80aebda45c1b

 Anthropic-Ratelimit-Input-Tokens-Limit: 200000

 Anthropic-Ratelimit-Input-Tokens-Remaining: 200000

-Anthropic-Ratelimit-Input-Tokens-Reset: 2025-05-14T00:18:00Z

+Anthropic-Ratelimit-Input-Tokens-Reset: 2025-05-14T16:36:00Z

 Anthropic-Ratelimit-Output-Tokens-Limit: 80000

 Anthropic-Ratelimit-Output-Tokens-Remaining: 80000

-Anthropic-Ratelimit-Output-Tokens-Reset: 2025-05-14T00:18:04Z

+Anthropic-Ratelimit-Output-Tokens-Reset: 2025-05-14T16:36:03Z

 Anthropic-Ratelimit-Requests-Limit: 4000

 Anthropic-Ratelimit-Requests-Remaining: 3999

-Anthropic-Ratelimit-Requests-Reset: 2025-05-14T00:17:59Z

+Anthropic-Ratelimit-Requests-Reset: 2025-05-14T16:35:58Z

 Anthropic-Ratelimit-Tokens-Limit: 280000

 Anthropic-Ratelimit-Tokens-Remaining: 280000

-Anthropic-Ratelimit-Tokens-Reset: 2025-05-14T00:18:00Z

+Anthropic-Ratelimit-Tokens-Reset: 2025-05-14T16:36:00Z

 Cf-Cache-Status: DYNAMIC

-Cf-Ray: 93f6373918bc7afd-SJC

+Cf-Ray: 93fbcfd2ac34236d-SJC

 Content-Type: application/json

-Date: Wed, 14 May 2025 00:18:04 GMT

-Request-Id: req_011CP6TmGW2vmPmS7JfqFK5U

+Date: Wed, 14 May 2025 16:36:03 GMT

+Request-Id: req_011CP7kLmfzqYMjT1roGU6g3

 Server: cloudflare

 Strict-Transport-Security: max-age=31536000; includeSubDomains; preload

 Via: 1.1 google

 X-Robots-Tag: none

 

-{"id":"msg_01K2J8Qx4ZGm7pds3aQd83SV","type":"message","role":"assistant","model":"claude-3-7-sonnet-20250219","content":[{"type":"text","text":"Here are the tools available to me:\n\n1. bash - Executes shell commands\n2. keyword_search - Searches files using keywords\n3. think - For thinking out loud, taking notes, or planning\n4. title - Sets conversation title\n5. precommit - Creates git branches and provides commit guidance\n6. done - Indicates task completion with a checklist\n7. codereview - Runs automated code review\n8. multiplechoice - Presents multiple choice questions to users\n9. Browser tools:\n   - browser_navigate, browser_click, browser_type, browser_wait_for\n   - browser_get_text, browser_eval, browser_scroll_into_view\n   - browser_resize, browser_recent_console_logs, browser_clear_console_logs\n   - browser_take_screenshot, browser_read_image\n10. patch - Modifies files with precise text edits\n\nThese tools allow me to perform tasks like executing code, searching files, interacting with browsers, editing files, and managing git repositories."}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":4,"cache_creation_input_tokens":3888,"cache_read_input_tokens":0,"output_tokens":234}}
\ No newline at end of file
+{"id":"msg_01SDrU5LWSJHPMGMWk8rrTcX","type":"message","role":"assistant","model":"claude-3-7-sonnet-20250219","content":[{"type":"text","text":"I can provide you with a brief list of the tools available to me:\n\n1. bash - Execute shell commands\n2. keyword_search - Find files with search terms\n3. think - Record thoughts and plans (no external effects)\n4. title - Set conversation title\n5. precommit - Create git branch for work\n6. done - Mark completion with checklist verification\n7. codereview - Run automated code review\n8. multiplechoice - Present options for user to choose from\n9. browser_* tools - Various browser automation functions (navigate, click, type, etc.)\n10. patch - Make precise text edits to files\n\nThese tools allow me to help with coding tasks, navigate codebases, make edits, run commands, interact with web pages, and plan/document my work."}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":4,"cache_creation_input_tokens":3890,"cache_read_input_tokens":0,"output_tokens":177}}
\ No newline at end of file