docs: reposition around the fleet of AI teammates + early-access CTA

[indykish]

Aligns docs.agentsfleet.net with the new marketing positioning (companion to agentsfleet#425) and removes the stealth framing.

What changed

• README + index.mdx lead with "a fleet of prebuilt AI teammates for recurring engineering work" instead of "a resident engineer for support escalations".
• index.mdx stealth callout → early-access CTA. The "Stealth-mode testing / private alpha" <Warning> is replaced by a Get early access card linking to the Clerk waitlist (accounts.agentsfleet.net/waitlist); the design-partner email (agentsfleet@agentmail.to) stays as the secondary path.
• "The 2am problem" → "A teammate that owns the outcome" — reframed around PR + deploy events, a scenario-backed fix, and human approval before merge/ship. Keeps platform-ops as the concrete flagship example.

Notes

• Historical changelog.mdx entries were left untouched (append-only history).
• Page title change is path-routed in docs.json, so nav is unaffected.

🤖 Generated with Claude Code

Greptile Summary

This PR repositions the docs landing page and README around the "fleet of prebuilt AI teammates" framing, replacing the stealth-mode warning with a first-class early-access CTA card that links directly to the Clerk waitlist.

• README.md: tagline and description updated to fleet framing; "Get early access" badge URL corrected from the marketing homepage to accounts.agentsfleet.net/waitlist, consistent with the new index.mdx CTA.
• index.mdx: <Warning> stealth callout swapped for a <Card> component pointing to the waitlist; intro section rewritten to lead with PR/deploy event scenarios and human-approval-gate language; platform-ops repositioned as one of many upcoming teammates.

Confidence Score: 5/5

Pure documentation and copy changes — no logic, no API surface, no data paths touched.

Both files contain only marketing copy, component swaps (Warning → Card), and URL updates. The waitlist URL is now consistent across README and index.mdx. No code paths, migrations, or runtime behavior are affected.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Tagline updated to "fleet of prebuilt AI teammates"; Get early access badge now points directly to accounts.agentsfleet.net/waitlist (consistent with index.mdx CTA).
index.mdx	Stealth Warning replaced with a Card CTA linking to the waitlist; intro section reframed around fleet/teammates positioning with human-approval gate language; no structural or component issues.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Event fires\n(PR, deploy failure, incident)"] --> B["Agent wakes\n(TRIGGER.md)"]
    B --> C["Gather evidence\n(CI logs, host state, data-plane)"]
    C --> D["Reason & open\nscenario-backed fix"]
    D --> E["Post evidenced diagnosis\nto Slack + replayable log"]
    E --> F{"Human approval"}
    F -->|Approved| G["Merge / Ship"]
    F -->|Rejected| H["Revise or close"]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A["Event fires\n(PR, deploy failure, incident)"] --> B["Agent wakes\n(TRIGGER.md)"]
    B --> C["Gather evidence\n(CI logs, host state, data-plane)"]
    C --> D["Reason & open\nscenario-backed fix"]
    D --> E["Post evidenced diagnosis\nto Slack + replayable log"]
    E --> F{"Human approval"}
    F -->|Approved| G["Merge / Ship"]
    F -->|Rejected| H["Revise or close"]

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_{Reviews (2): Last reviewed commit: "Update README.md" | Re-trigger Greptile}

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